diff --git a/crates/engine/tests/plugin_import.rs b/crates/engine/tests/plugin_import.rs
index 7cb8d1a0a..7f62de2b7 100644
--- a/crates/engine/tests/plugin_import.rs
+++ b/crates/engine/tests/plugin_import.rs
@@ -51,6 +51,14 @@ fn objects(s: &Session) -> usize {
     s.doc().unwrap().doc.layers[0].children().unwrap().len()
 }
 
+/// The open documents' count, the active one's index, its undo and redo steps, whether it has
+/// unsaved changes, and its content.
+fn state(s: &mut Session) -> (usize, Option<usize>, usize, usize, bool, Value) {
+    let content = s.execute("document.inspect", &json!({})).unwrap();
+    let d = s.doc().unwrap();
+    (s.documents().len(), s.active_index(), d.history.undo.len(), d.history.redo.len(), d.is_dirty(), content)
+}
+
 /// A fresh folder for files this test writes.
 fn tmp_dir(tag: &str) -> PathBuf {
     let d = std::env::temp_dir().join(format!("vc-plugin-import-{tag}-{}", std::process::id()));
@@ -195,9 +203,11 @@ fn importer_names_that_do_not_fit_are_errors() {
     let mut s = Session::new();
     echo(&mut s, "test.names", r#"["tsn"]"#);
     install(&mut s, &tpl::returning(&tpl::manifest("test.names.filter", "filter", "{}"), r#"{"objects":[]}"#));
+    install(&mut s, &tpl::returning(&tpl::exporter("test.names.exporter", r#"["tsx"]"#, "{}"), r#"{"dataBase64":""}"#));
     let cases = [
         (json!({"importer": "plugin.test.names"}), "x.png", "opens .tsn files, not `x.png`"),
-        (json!({"importer": "plugin.test.names.filter"}), "x.tsn", "is a filter, not an importer"),
+        (json!({"importer": "plugin.test.names.filter"}), "x.tsn", "is a plug-in of kind `filter`, not an importer"),
+        (json!({"importer": "plugin.test.names.exporter"}), "x.tsn", "is a plug-in of kind `exporter`, not an importer"),
         (json!({"importer": "plugin.test.nothere"}), "x.tsn", "test.nothere"),
         (json!({"importer": 3}), "x.tsn", "`importer` must be a plug-in format id"),
     ];
@@ -257,6 +267,26 @@ fn failures_open_nothing() {
     install(&mut s, &tpl::module(&tpl::importer("test.fail.traps", r#"["tsf"]"#, "{}"), "(unreachable)", "", 1));
     assert!(open(&mut s, "x.tsf", b"?", json!({"importer": "plugin.test.fail.traps"})).is_err());
     assert!(s.documents().is_empty(), "nothing opened");
+
+    // A document that is already open keeps its tab, content and undo and redo steps.
+    install(&mut s, &tpl::returning(&tpl::importer("test.fail.opens", r#"["tsk"]"#, "{}"), RECT));
+    install(&mut s, &tpl::module(&tpl::importer("test.fail.spins", r#"["tsf"]"#, "{}"), "(loop $l (br $l)) (i64.const 0)", "", 1));
+    open(&mut s, "Kept.tsk", b"?", json!({})).unwrap();
+    s.execute("select.all", &json!({})).unwrap();
+    s.execute("object.move", &json!({"dx": 5, "dy": 0})).unwrap();
+    s.execute("object.move", &json!({"dx": 5, "dy": 0})).unwrap();
+    s.execute("edit.undo", &json!({})).unwrap();
+    let before = state(&mut s);
+    assert!(before.2 > 0 && before.3 > 0, "{before:?}");
+    for id in cases.iter().map(|c| c.0).chain(["test.fail.traps"]) {
+        assert!(open(&mut s, "x.tsf", b"?", json!({"importer": format!("plugin.{id}")})).is_err(), "{id}");
+        assert_eq!(state(&mut s), before, "{id}");
+    }
+    let token = vectorcraft_doc::cancel::CancelToken::new();
+    token.cancel();
+    let r = vectorcraft_doc::cancel::scope(&token, None, || open(&mut s, "x.tsf", b"?", json!({"importer": "plugin.test.fail.spins"})));
+    assert!(matches!(r, Err(EngineError::Cancelled)), "{r:?}");
+    assert_eq!(state(&mut s), before, "cancelled");
 }
 
 /// Cancel stops an importer between two slices of its budget, and nothing opens: here one that
diff --git a/crates/plugins/src/export.rs b/crates/plugins/src/export.rs
index 9ecc76277..300bd80d2 100644
--- a/crates/plugins/src/export.rs
+++ b/crates/plugins/src/export.rs
@@ -83,7 +83,7 @@ pub fn limits(plugin: &Plugin) -> Limits {
 pub fn run(plugin: &Plugin, document: &[u8], params: &Value, target: Target) -> Result<Exported> {
     let m = plugin.manifest();
     if m.kind != Kind::Exporter {
-        return Err(Error::Params(format!("`{}` is a {}, not an exporter", m.id, m.kind.name())));
+        return Err(Error::Params(format!("`{}` is a plug-in of kind `{}`, not an exporter", m.id, m.kind.name())));
     }
     let mut params = Value::Object(m.resolve_params(params)?);
     params["_context"] = json!({"mode": "export", "extension": target.extension, "name": target.name});
diff --git a/crates/plugins/src/import.rs b/crates/plugins/src/import.rs
index 5a7be6a85..6229d8959 100644
--- a/crates/plugins/src/import.rs
+++ b/crates/plugins/src/import.rs
@@ -51,7 +51,7 @@ pub fn named(importer: &str) -> Result<Arc<Plugin>> {
 
 /// The error of plug-in `m`, which is not an importer, asked to import.
 fn not_importer(m: &crate::Manifest) -> Error {
-    Error::Params(format!("`{}` is a {}, not an importer", m.id, m.kind.name()))
+    Error::Params(format!("`{}` is a plug-in of kind `{}`, not an importer", m.id, m.kind.name()))
 }
 
 /// The installed importers that list extension `ext` (any case, leading dot allowed), by plug-in
diff --git a/crates/plugins/tests/abi.rs b/crates/plugins/tests/abi.rs
index f5b78d224..1463f9916 100644
--- a/crates/plugins/tests/abi.rs
+++ b/crates/plugins/tests/abi.rs
@@ -272,7 +272,11 @@ fn an_exporter_returns_its_file_with_an_export_s_budget() {
     // Its parameters are checked, and a filter is not an exporter.
     assert!(matches!(export::run(&p, b"{}", &json!({"level": "high"}), target), Err(Error::Params(_))));
     let filter = Plugin::load(&ok_module("(i64.const 0)"), Limits::default()).unwrap();
-    assert!(matches!(export::run(&filter, b"{}", &Value::Null, target), Err(Error::Params(_))));
+    let e = export::run(&filter, b"{}", &Value::Null, target).unwrap_err();
+    assert!(matches!(e, Error::Params(_)) && e.to_string().contains("is a plug-in of kind `filter`, not an exporter"), "{e}");
+    let importer = Plugin::load(&build(&tpl::returning(&tpl::importer("test.reads", r#"["tst"]"#, "{}"), "{}")), Limits::default()).unwrap();
+    let e = export::run(&importer, b"{}", &Value::Null, target).unwrap_err();
+    assert!(e.to_string().contains("is a plug-in of kind `importer`, not an exporter"), "{e}");
 }
 
 /// The echo exporter the engine and UI tests read back what they hand a plug-in with: its file is
diff --git a/crates/ui-egui/src/i18n/ca.tsv b/crates/ui-egui/src/i18n/ca.tsv
index 953914129..5d0a001b8 100644
--- a/crates/ui-egui/src/i18n/ca.tsv
+++ b/crates/ui-egui/src/i18n/ca.tsv
@@ -6473,7 +6473,8 @@ breakText	Glyphs	Glifs
 @msg	missing `importer` (see document.formats)	falta `importer` (vegeu document.formats)
 @msg	`importer` must be a plug-in format id (see document.formats)	`importer` ha de ser l’id de format d’un complement (vegeu document.formats)
 @msg	“{shown}” opens {_1} files, not `{_2}`	«{shown}» obre fitxers {_1}, no `{_2}`
-@msg	`{_1}` is a {_2}, not an importer	`{_1}` és un {_2}, no un importador
+@msg	`{_1}` is a plug-in of kind `{_2}`, not an importer	`{_1}` és un complement del tipus `{_2}`, no un importador
+@msg	`{_1}` is a plug-in of kind `{_2}`, not an exporter	`{_1}` és un complement del tipus `{_2}`, no un exportador
 @msg	`{_1}` is an importer: open a file with document.open {{"importer"}"}}	`{_1}` és un importador: obriu un fitxer amb document.open {{"importer"}"}}
 @msg	the importer returned no objects	l’importador no ha retornat cap objecte
 @msg	an importer returns `objects` and `warnings`, not `{key}`	un importador retorna `objects` i `warnings`, no `{key}`
diff --git a/crates/ui-egui/src/i18n/cs.tsv b/crates/ui-egui/src/i18n/cs.tsv
index dc95fe117..7366381e2 100644
--- a/crates/ui-egui/src/i18n/cs.tsv
+++ b/crates/ui-egui/src/i18n/cs.tsv
@@ -6490,7 +6490,8 @@ breakText	Glyphs	Glyfy
 @msg	missing `importer` (see document.formats)	chybí `importer` (viz document.formats)
 @msg	`importer` must be a plug-in format id (see document.formats)	`importer` musí být ID formátu zásuvného modulu (viz document.formats)
 @msg	“{shown}” opens {_1} files, not `{_2}`	„{shown}“ otevírá soubory {_1}, ne `{_2}`
-@msg	`{_1}` is a {_2}, not an importer	`{_1}` je {_2}, ne importní zásuvný modul
+@msg	`{_1}` is a plug-in of kind `{_2}`, not an importer	`{_1}` je zásuvný modul druhu `{_2}`, ne importní zásuvný modul
+@msg	`{_1}` is a plug-in of kind `{_2}`, not an exporter	`{_1}` je zásuvný modul druhu `{_2}`, ne exportní zásuvný modul
 @msg	`{_1}` is an importer: open a file with document.open {{"importer"}"}}	`{_1}` je importní zásuvný modul: otevřete soubor pomocí document.open {{"importer"}"}}
 @msg	the importer returned no objects	importní zásuvný modul nevrátil žádné objekty
 @msg	an importer returns `objects` and `warnings`, not `{key}`	importní zásuvný modul vrací `objects` a `warnings`, ne `{key}`
diff --git a/crates/ui-egui/src/i18n/de.tsv b/crates/ui-egui/src/i18n/de.tsv
index 6ae88f96e..f34b88a6b 100644
--- a/crates/ui-egui/src/i18n/de.tsv
+++ b/crates/ui-egui/src/i18n/de.tsv
@@ -6076,7 +6076,8 @@ breakText	Glyphs	Glyphen
 @msg	missing `importer` (see document.formats)	`importer` fehlt (siehe document.formats)
 @msg	`importer` must be a plug-in format id (see document.formats)	`importer` muss die Format-ID eines Plug-ins sein (siehe document.formats)
 @msg	“{shown}” opens {_1} files, not `{_2}`	„{shown}“ öffnet {_1}-Dateien, nicht `{_2}`
-@msg	`{_1}` is a {_2}, not an importer	`{_1}` ist ein {_2}, kein Import-Plug-in
+@msg	`{_1}` is a plug-in of kind `{_2}`, not an importer	`{_1}` ist ein Plug-in der Art `{_2}`, kein Import-Plug-in
+@msg	`{_1}` is a plug-in of kind `{_2}`, not an exporter	`{_1}` ist ein Plug-in der Art `{_2}`, kein Export-Plug-in
 @msg	`{_1}` is an importer: open a file with document.open {{"importer"}"}}	`{_1}` ist ein Import-Plug-in: Öffnen Sie eine Datei mit document.open {{"importer"}"}}
 @msg	the importer returned no objects	das Import-Plug-in hat keine Objekte zurückgegeben
 @msg	an importer returns `objects` and `warnings`, not `{key}`	ein Import-Plug-in gibt `objects` und `warnings` zurück, nicht `{key}`
diff --git a/crates/ui-egui/src/i18n/el.tsv b/crates/ui-egui/src/i18n/el.tsv
index 5c3f193c5..1d245a392 100644
--- a/crates/ui-egui/src/i18n/el.tsv
+++ b/crates/ui-egui/src/i18n/el.tsv
@@ -6442,7 +6442,8 @@ breakText	Glyphs	Γλύφοι
 @msg	missing `importer` (see document.formats)	λείπει το `importer` (δείτε document.formats)
 @msg	`importer` must be a plug-in format id (see document.formats)	το `importer` πρέπει να είναι αναγνωριστικό μορφής πρόσθετου (δείτε document.formats)
 @msg	“{shown}” opens {_1} files, not `{_2}`	το «{shown}» ανοίγει αρχεία {_1}, όχι `{_2}`
-@msg	`{_1}` is a {_2}, not an importer	το `{_1}` είναι {_2}, όχι πρόσθετο εισαγωγής
+@msg	`{_1}` is a plug-in of kind `{_2}`, not an importer	το `{_1}` είναι πρόσθετο τύπου `{_2}`, όχι πρόσθετο εισαγωγής
+@msg	`{_1}` is a plug-in of kind `{_2}`, not an exporter	το `{_1}` είναι πρόσθετο τύπου `{_2}`, όχι πρόσθετο εξαγωγής
 @msg	`{_1}` is an importer: open a file with document.open {{"importer"}"}}	το `{_1}` είναι πρόσθετο εισαγωγής: ανοίξτε ένα αρχείο με document.open {{"importer"}"}}
 @msg	the importer returned no objects	το πρόσθετο εισαγωγής δεν επέστρεψε κανένα αντικείμενο
 @msg	an importer returns `objects` and `warnings`, not `{key}`	ένα πρόσθετο εισαγωγής επιστρέφει `objects` και `warnings`, όχι `{key}`
diff --git a/crates/ui-egui/src/i18n/es.tsv b/crates/ui-egui/src/i18n/es.tsv
index 99c7c5d0c..edeba9d58 100644
--- a/crates/ui-egui/src/i18n/es.tsv
+++ b/crates/ui-egui/src/i18n/es.tsv
@@ -6432,7 +6432,8 @@ breakText	Glyphs	Glifos
 @msg	missing `importer` (see document.formats)	falta `importer` (consulte document.formats)
 @msg	`importer` must be a plug-in format id (see document.formats)	`importer` debe ser el id de formato de un plugin (consulte document.formats)
 @msg	“{shown}” opens {_1} files, not `{_2}`	«{shown}» abre archivos {_1}, no `{_2}`
-@msg	`{_1}` is a {_2}, not an importer	`{_1}` es un {_2}, no un plugin de importación
+@msg	`{_1}` is a plug-in of kind `{_2}`, not an importer	`{_1}` es un plugin de tipo `{_2}`, no un plugin de importación
+@msg	`{_1}` is a plug-in of kind `{_2}`, not an exporter	`{_1}` es un plugin de tipo `{_2}`, no un plugin de exportación
 @msg	`{_1}` is an importer: open a file with document.open {{"importer"}"}}	`{_1}` es un plugin de importación: abra un archivo con document.open {{"importer"}"}}
 @msg	the importer returned no objects	el plugin de importación no devolvió ningún objeto
 @msg	an importer returns `objects` and `warnings`, not `{key}`	un plugin de importación devuelve `objects` y `warnings`, no `{key}`
diff --git a/crates/ui-egui/src/i18n/fi.tsv b/crates/ui-egui/src/i18n/fi.tsv
index 53103e483..eef4c97f8 100644
--- a/crates/ui-egui/src/i18n/fi.tsv
+++ b/crates/ui-egui/src/i18n/fi.tsv
@@ -6525,7 +6525,8 @@ breakText	Glyphs	Merkit
 @msg	missing `importer` (see document.formats)	`importer` puuttuu (katso document.formats)
 @msg	`importer` must be a plug-in format id (see document.formats)	`importer` on oltava laajennuksen muototunnus (katso document.formats)
 @msg	“{shown}” opens {_1} files, not `{_2}`	”{shown}” avaa {_1}-tiedostoja, ei `{_2}`
-@msg	`{_1}` is a {_2}, not an importer	`{_1}` on {_2}, ei tuontilaajennus
+@msg	`{_1}` is a plug-in of kind `{_2}`, not an importer	`{_1}` on lajin `{_2}` laajennus, ei tuontilaajennus
+@msg	`{_1}` is a plug-in of kind `{_2}`, not an exporter	`{_1}` on lajin `{_2}` laajennus, ei vientilaajennus
 @msg	`{_1}` is an importer: open a file with document.open {{"importer"}"}}	`{_1}` on tuontilaajennus: avaa tiedosto komennolla document.open {{"importer"}"}}
 @msg	the importer returned no objects	tuontilaajennus ei palauttanut objekteja
 @msg	an importer returns `objects` and `warnings`, not `{key}`	tuontilaajennus palauttaa `objects` ja `warnings`, ei `{key}`
diff --git a/crates/ui-egui/src/i18n/fr.tsv b/crates/ui-egui/src/i18n/fr.tsv
index 717a8a3f6..97f74171a 100644
--- a/crates/ui-egui/src/i18n/fr.tsv
+++ b/crates/ui-egui/src/i18n/fr.tsv
@@ -6485,7 +6485,8 @@ breakText	Glyphs	Glyphes
 @msg	missing `importer` (see document.formats)	`importer` manquant (voir document.formats)
 @msg	`importer` must be a plug-in format id (see document.formats)	`importer` doit être l’identifiant de format d’un module externe (voir document.formats)
 @msg	“{shown}” opens {_1} files, not `{_2}`	« {shown} » ouvre les fichiers {_1}, pas `{_2}`
-@msg	`{_1}` is a {_2}, not an importer	`{_1}` est un {_2}, pas un module externe d’importation
+@msg	`{_1}` is a plug-in of kind `{_2}`, not an importer	`{_1}` est un module externe de type `{_2}`, pas un module externe d’importation
+@msg	`{_1}` is a plug-in of kind `{_2}`, not an exporter	`{_1}` est un module externe de type `{_2}`, pas un module externe d’exportation
 @msg	`{_1}` is an importer: open a file with document.open {{"importer"}"}}	`{_1}` est un module externe d’importation : ouvrez un fichier avec document.open {{"importer"}"}}
 @msg	the importer returned no objects	le module externe d’importation n’a renvoyé aucun objet
 @msg	an importer returns `objects` and `warnings`, not `{key}`	un module externe d’importation renvoie `objects` et `warnings`, pas `{key}`
diff --git a/crates/ui-egui/src/i18n/hi.tsv b/crates/ui-egui/src/i18n/hi.tsv
index 7a6de9d9d..9ed4c6f39 100644
--- a/crates/ui-egui/src/i18n/hi.tsv
+++ b/crates/ui-egui/src/i18n/hi.tsv
@@ -5376,7 +5376,7 @@
 @msg	`{_1}` can't be edited or removed	`{_1}` को संपादित या हटाया नहीं जा सकता है
 @msg	`{_1}` has no brushes to apply	`{_1}` को लागू करने के लिए कोई ब्रश नहीं है
 @msg	`{_1}` has no symbols to place	`{_1}` के पास कोई सिंबल नहीं है
-@msg	`{_1}` is a {_2}, not an exporter	`{_1}` एक {_2} है, एक निर्यातक नहीं है
+@msg	`{_1}` is a plug-in of kind `{_2}`, not an exporter	`{_1}` `{_2}` प्रकार का प्लग-इन है, निर्यातक नहीं
 @msg	`{_1}` is a live effect: apply it with effect.apply {{"effect"}"}}	`{_1}` एक लाइव इफ़ेक्ट है: इसे effect.apply {{"effect"}"}} के साथ लागू करें
 @msg	`{_1}` is an exporter: export with document.export {{"format"}"}}	`{_1}` एक एक्सपोर्टर है: document.export {{"format"}"}} से एक्सपोर्ट करें
 @msg	`{_1}` is built in and always listed	`{_1}` बनाया गया है और हमेशा सूचीबद्ध है
@@ -7969,7 +7969,7 @@ theme	Appearance	अपीयरेंस
 @msg	missing `importer` (see document.formats)	`importer` नहीं दिया गया (document.formats देखें)
 @msg	`importer` must be a plug-in format id (see document.formats)	`importer` किसी प्लग-इन का फ़ॉर्मेट id होना चाहिए (document.formats देखें)
 @msg	“{shown}” opens {_1} files, not `{_2}`	“{shown}” {_1} फ़ाइलें खोलता है, `{_2}` नहीं
-@msg	`{_1}` is a {_2}, not an importer	`{_1}` एक {_2} है, इंपोर्टर नहीं
+@msg	`{_1}` is a plug-in of kind `{_2}`, not an importer	`{_1}` `{_2}` प्रकार का प्लग-इन है, इंपोर्टर नहीं
 @msg	`{_1}` is an importer: open a file with document.open {{"importer"}"}}	`{_1}` एक इंपोर्टर है: document.open {{"importer"}"}} से फ़ाइल खोलें
 @msg	the importer returned no objects	इंपोर्टर ने कोई ऑब्जेक्ट नहीं लौटाया
 @msg	an importer returns `objects` and `warnings`, not `{key}`	इंपोर्टर `objects` और `warnings` लौटाता है, `{key}` नहीं
diff --git a/crates/ui-egui/src/i18n/hu.tsv b/crates/ui-egui/src/i18n/hu.tsv
index b0b517101..03f40e14c 100644
--- a/crates/ui-egui/src/i18n/hu.tsv
+++ b/crates/ui-egui/src/i18n/hu.tsv
@@ -6474,7 +6474,8 @@ breakText	Glyphs	Glifák
 @msg	missing `importer` (see document.formats)	hiányzik az `importer` (lásd document.formats)
 @msg	`importer` must be a plug-in format id (see document.formats)	az `importer` egy bővítmény formátumazonosítója kell legyen (lásd document.formats)
 @msg	“{shown}” opens {_1} files, not `{_2}`	„{shown}” {_1} fájlokat nyit meg, nem `{_2}`
-@msg	`{_1}` is a {_2}, not an importer	`{_1}`: {_2}, nem importáló bővítmény
+@msg	`{_1}` is a plug-in of kind `{_2}`, not an importer	`{_1}`: `{_2}` fajtájú bővítmény, nem importáló bővítmény
+@msg	`{_1}` is a plug-in of kind `{_2}`, not an exporter	`{_1}`: `{_2}` fajtájú bővítmény, nem exportáló bővítmény
 @msg	`{_1}` is an importer: open a file with document.open {{"importer"}"}}	`{_1}` importáló bővítmény: nyisson meg egy fájlt a document.open {{"importer"}"}} paranccsal
 @msg	the importer returned no objects	az importáló bővítmény nem adott vissza objektumot
 @msg	an importer returns `objects` and `warnings`, not `{key}`	az importáló bővítmény `objects` és `warnings` értéket ad vissza, nem `{key}`
diff --git a/crates/ui-egui/src/i18n/it.tsv b/crates/ui-egui/src/i18n/it.tsv
index b9731552d..4b09769d3 100644
--- a/crates/ui-egui/src/i18n/it.tsv
+++ b/crates/ui-egui/src/i18n/it.tsv
@@ -6110,7 +6110,8 @@ breakText	Glyphs	Glifi
 @msg	missing `importer` (see document.formats)	manca `importer` (vedi document.formats)
 @msg	`importer` must be a plug-in format id (see document.formats)	`importer` deve essere l’id di formato di un plug-in (vedi document.formats)
 @msg	“{shown}” opens {_1} files, not `{_2}`	«{shown}» apre file {_1}, non `{_2}`
-@msg	`{_1}` is a {_2}, not an importer	`{_1}` è un {_2}, non un plug-in di importazione
+@msg	`{_1}` is a plug-in of kind `{_2}`, not an importer	`{_1}` è un plug-in di tipo `{_2}`, non un plug-in di importazione
+@msg	`{_1}` is a plug-in of kind `{_2}`, not an exporter	`{_1}` è un plug-in di tipo `{_2}`, non un plug-in di esportazione
 @msg	`{_1}` is an importer: open a file with document.open {{"importer"}"}}	`{_1}` è un plug-in di importazione: apri un file con document.open {{"importer"}"}}
 @msg	the importer returned no objects	il plug-in di importazione non ha restituito alcun oggetto
 @msg	an importer returns `objects` and `warnings`, not `{key}`	un plug-in di importazione restituisce `objects` e `warnings`, non `{key}`
diff --git a/crates/ui-egui/src/i18n/ja.tsv b/crates/ui-egui/src/i18n/ja.tsv
index 128cf09ee..11e1b702b 100644
--- a/crates/ui-egui/src/i18n/ja.tsv
+++ b/crates/ui-egui/src/i18n/ja.tsv
@@ -6175,7 +6175,8 @@ breakText	Glyphs	字形
 @msg	missing `importer` (see document.formats)	`importer` がありません (document.formats を参照)
 @msg	`importer` must be a plug-in format id (see document.formats)	`importer` にはプラグインの形式 ID を指定してください (document.formats を参照)
 @msg	“{shown}” opens {_1} files, not `{_2}`	「{shown}」が開くのは {_1} ファイルで、`{_2}` ではありません
-@msg	`{_1}` is a {_2}, not an importer	`{_1}` は {_2} で、読み込みプラグインではありません
+@msg	`{_1}` is a plug-in of kind `{_2}`, not an importer	`{_1}` は種類 `{_2}` のプラグインで、読み込みプラグインではありません
+@msg	`{_1}` is a plug-in of kind `{_2}`, not an exporter	`{_1}` は種類 `{_2}` のプラグインで、書き出しプラグインではありません
 @msg	`{_1}` is an importer: open a file with document.open {{"importer"}"}}	`{_1}` は読み込みプラグインです: document.open {{"importer"}"}} でファイルを開いてください
 @msg	the importer returned no objects	読み込みプラグインがオブジェクトを返しませんでした
 @msg	an importer returns `objects` and `warnings`, not `{key}`	読み込みプラグインが返すのは `objects` と `warnings` で、`{key}` ではありません
diff --git a/crates/ui-egui/src/i18n/ka.tsv b/crates/ui-egui/src/i18n/ka.tsv
index bb91ca78f..5d5cb1300 100644
--- a/crates/ui-egui/src/i18n/ka.tsv
+++ b/crates/ui-egui/src/i18n/ka.tsv
@@ -6502,7 +6502,8 @@ font-script	Japanese	იაპონური
 @msg	missing `importer` (see document.formats)	`importer` აკლია (იხ. document.formats)
 @msg	`importer` must be a plug-in format id (see document.formats)	`importer` უნდა იყოს პლაგინის ფორმატის ID (იხ. document.formats)
 @msg	“{shown}” opens {_1} files, not `{_2}`	„{shown}“ ხსნის {_1} ფაილებს და არა `{_2}`-ს
-@msg	`{_1}` is a {_2}, not an importer	`{_1}` არის {_2} და არა იმპორტის პლაგინი
+@msg	`{_1}` is a plug-in of kind `{_2}`, not an importer	`{_1}` არის `{_2}` სახის პლაგინი და არა იმპორტის პლაგინი
+@msg	`{_1}` is a plug-in of kind `{_2}`, not an exporter	`{_1}` არის `{_2}` სახის პლაგინი და არა ექსპორტის პლაგინი
 @msg	`{_1}` is an importer: open a file with document.open {{"importer"}"}}	`{_1}` იმპორტის პლაგინია: გახსენით ფაილი document.open {{"importer"}"}}-ით
 @msg	the importer returned no objects	იმპორტის პლაგინმა ობიექტები არ დააბრუნა
 @msg	an importer returns `objects` and `warnings`, not `{key}`	იმპორტის პლაგინი აბრუნებს `objects`-ს და `warnings`-ს და არა `{key}`-ს
diff --git a/crates/ui-egui/src/i18n/ko.tsv b/crates/ui-egui/src/i18n/ko.tsv
index 4c93a520d..fa09154e6 100644
--- a/crates/ui-egui/src/i18n/ko.tsv
+++ b/crates/ui-egui/src/i18n/ko.tsv
@@ -6071,7 +6071,8 @@ breakText	Glyphs	글리프
 @msg	missing `importer` (see document.formats)	`importer`가 없습니다(document.formats 참조)
 @msg	`importer` must be a plug-in format id (see document.formats)	`importer`는 플러그인의 형식 ID여야 합니다(document.formats 참조)
 @msg	“{shown}” opens {_1} files, not `{_2}`	“{shown}”은(는) {_1} 파일을 엽니다. `{_2}`은(는) 열지 않습니다
-@msg	`{_1}` is a {_2}, not an importer	`{_1}`은(는) {_2}이며 가져오기 플러그인이 아닙니다
+@msg	`{_1}` is a plug-in of kind `{_2}`, not an importer	`{_1}`은(는) `{_2}` 종류의 플러그인이며 가져오기 플러그인이 아닙니다
+@msg	`{_1}` is a plug-in of kind `{_2}`, not an exporter	`{_1}`은(는) `{_2}` 종류의 플러그인이며 내보내기 플러그인이 아닙니다
 @msg	`{_1}` is an importer: open a file with document.open {{"importer"}"}}	`{_1}`은(는) 가져오기 플러그인입니다: document.open {{"importer"}"}}로 파일을 여세요
 @msg	the importer returned no objects	가져오기 플러그인이 개체를 반환하지 않았습니다
 @msg	an importer returns `objects` and `warnings`, not `{key}`	가져오기 플러그인은 `{key}`가 아닌 `objects`와 `warnings`를 반환합니다
diff --git a/crates/ui-egui/src/i18n/pl.tsv b/crates/ui-egui/src/i18n/pl.tsv
index 4467230b7..72f9f1894 100644
--- a/crates/ui-egui/src/i18n/pl.tsv
+++ b/crates/ui-egui/src/i18n/pl.tsv
@@ -6345,7 +6345,8 @@ breakText	Glyphs	Glify
 @msg	missing `importer` (see document.formats)	brak `importer` (zobacz document.formats)
 @msg	`importer` must be a plug-in format id (see document.formats)	`importer` musi być identyfikatorem formatu wtyczki (zobacz document.formats)
 @msg	“{shown}” opens {_1} files, not `{_2}`	„{shown}” otwiera pliki {_1}, a nie `{_2}`
-@msg	`{_1}` is a {_2}, not an importer	`{_1}` to {_2}, a nie wtyczka importu
+@msg	`{_1}` is a plug-in of kind `{_2}`, not an importer	`{_1}` to wtyczka rodzaju `{_2}`, a nie wtyczka importu
+@msg	`{_1}` is a plug-in of kind `{_2}`, not an exporter	`{_1}` to wtyczka rodzaju `{_2}`, a nie wtyczka eksportu
 @msg	`{_1}` is an importer: open a file with document.open {{"importer"}"}}	`{_1}` to wtyczka importu: otwórz plik za pomocą document.open {{"importer"}"}}
 @msg	the importer returned no objects	wtyczka importu nie zwróciła żadnych obiektów
 @msg	an importer returns `objects` and `warnings`, not `{key}`	wtyczka importu zwraca `objects` i `warnings`, a nie `{key}`
diff --git a/crates/ui-egui/src/i18n/pt-br.tsv b/crates/ui-egui/src/i18n/pt-br.tsv
index 3fae0ea3a..22fd661a9 100644
--- a/crates/ui-egui/src/i18n/pt-br.tsv
+++ b/crates/ui-egui/src/i18n/pt-br.tsv
@@ -6563,7 +6563,8 @@ swatch	Yellow Green	Verde-amarelado
 @msg	missing `importer` (see document.formats)	falta `importer` (consulte document.formats)
 @msg	`importer` must be a plug-in format id (see document.formats)	`importer` deve ser o id de formato de um plug-in (consulte document.formats)
 @msg	“{shown}” opens {_1} files, not `{_2}`	“{shown}” abre arquivos {_1}, não `{_2}`
-@msg	`{_1}` is a {_2}, not an importer	`{_1}` é um {_2}, não um plug-in de importação
+@msg	`{_1}` is a plug-in of kind `{_2}`, not an importer	`{_1}` é um plug-in do tipo `{_2}`, não um plug-in de importação
+@msg	`{_1}` is a plug-in of kind `{_2}`, not an exporter	`{_1}` é um plug-in do tipo `{_2}`, não um plug-in de exportação
 @msg	`{_1}` is an importer: open a file with document.open {{"importer"}"}}	`{_1}` é um plug-in de importação: abra um arquivo com document.open {{"importer"}"}}
 @msg	the importer returned no objects	o plug-in de importação não retornou nenhum objeto
 @msg	an importer returns `objects` and `warnings`, not `{key}`	um plug-in de importação retorna `objects` e `warnings`, não `{key}`
diff --git a/crates/ui-egui/src/i18n/ru.tsv b/crates/ui-egui/src/i18n/ru.tsv
index 33f826525..1193f43ef 100644
--- a/crates/ui-egui/src/i18n/ru.tsv
+++ b/crates/ui-egui/src/i18n/ru.tsv
@@ -6579,7 +6579,8 @@ shape	Open	Открытый
 @msg	missing `importer` (see document.formats)	не указан `importer` (см. document.formats)
 @msg	`importer` must be a plug-in format id (see document.formats)	`importer` должен быть идентификатором формата модуля (см. document.formats)
 @msg	“{shown}” opens {_1} files, not `{_2}`	«{shown}» открывает файлы {_1}, а не `{_2}`
-@msg	`{_1}` is a {_2}, not an importer	`{_1}` — это {_2}, а не модуль импорта
+@msg	`{_1}` is a plug-in of kind `{_2}`, not an importer	`{_1}` является модулем вида `{_2}`, а не модулем импорта
+@msg	`{_1}` is a plug-in of kind `{_2}`, not an exporter	`{_1}` является модулем вида `{_2}`, а не модулем экспорта
 @msg	`{_1}` is an importer: open a file with document.open {{"importer"}"}}	`{_1}` — модуль импорта: откройте файл с помощью document.open {{"importer"}"}}
 @msg	the importer returned no objects	модуль импорта не вернул ни одного объекта
 @msg	an importer returns `objects` and `warnings`, not `{key}`	модуль импорта возвращает `objects` и `warnings`, а не `{key}`
diff --git a/crates/ui-egui/src/i18n/sv.tsv b/crates/ui-egui/src/i18n/sv.tsv
index ee1822273..85ed00f85 100644
--- a/crates/ui-egui/src/i18n/sv.tsv
+++ b/crates/ui-egui/src/i18n/sv.tsv
@@ -6643,7 +6643,7 @@ digits	Hindi	Hindi
 @msg	{what} points outside memory	{what} pekar utanför minnet
 @msg	{what} would print on more than {MAX_TILES} tiles: scale it down	{what} skulle skrivas ut på fler än {MAX_TILES} rutor: skala ned det
 @msg	`{_1}` can't be edited or removed	`{_1}` kan inte redigeras eller tas bort
-@msg	`{_1}` is a {_2}, not an exporter	`{_1}` är av typen {_2}, inte en exportfunktion
+@msg	`{_1}` is a plug-in of kind `{_2}`, not an exporter	`{_1}` är ett plugin av typen `{_2}`, inte en exportfunktion
 @msg	`{_1}` is a live effect: apply it with effect.apply {{"effect"}"}}	`{_1}` är en live-effekt: använd den med effect.apply {{"effect"}"}}
 @msg	`{_1}` is an exporter: export with document.export {{"format"}"}}	`{_1}` är en exportfunktion: exportera med document.export {{"format"}"}}
 @msg	`{_1}` is built in and always listed	`{_1}` är inbyggd och listas alltid
@@ -7977,7 +7977,7 @@ digits	Hindi	Hindi
 @msg	missing `importer` (see document.formats)	`importer` saknas (se document.formats)
 @msg	`importer` must be a plug-in format id (see document.formats)	`importer` måste vara ett formatid för ett plugin (se document.formats)
 @msg	“{shown}” opens {_1} files, not `{_2}`	”{shown}” öppnar {_1}-filer, inte `{_2}`
-@msg	`{_1}` is a {_2}, not an importer	`{_1}` är av typen {_2}, inte en importfunktion
+@msg	`{_1}` is a plug-in of kind `{_2}`, not an importer	`{_1}` är ett plugin av typen `{_2}`, inte en importfunktion
 @msg	`{_1}` is an importer: open a file with document.open {{"importer"}"}}	`{_1}` är en importfunktion: öppna en fil med document.open {{"importer"}"}}
 @msg	the importer returned no objects	importfunktionen returnerade inga objekt
 @msg	an importer returns `objects` and `warnings`, not `{key}`	en importfunktion returnerar `objects` och `warnings`, inte `{key}`
diff --git a/crates/ui-egui/src/i18n/tr.tsv b/crates/ui-egui/src/i18n/tr.tsv
index fb4269e2f..0d2960564 100644
--- a/crates/ui-egui/src/i18n/tr.tsv
+++ b/crates/ui-egui/src/i18n/tr.tsv
@@ -6447,7 +6447,8 @@ breakText	Glyphs	Glifler
 @msg	missing `importer` (see document.formats)	`importer` eksik (bkz. document.formats)
 @msg	`importer` must be a plug-in format id (see document.formats)	`importer` bir eklentinin biçim kimliği olmalıdır (bkz. document.formats)
 @msg	“{shown}” opens {_1} files, not `{_2}`	“{shown}” {_1} dosyalarını açar, `{_2}` dosyasını değil
-@msg	`{_1}` is a {_2}, not an importer	`{_1}` bir {_2}, içe aktarma eklentisi değil
+@msg	`{_1}` is a plug-in of kind `{_2}`, not an importer	`{_1}`, `{_2}` türünde bir eklentidir, içe aktarma eklentisi değildir
+@msg	`{_1}` is a plug-in of kind `{_2}`, not an exporter	`{_1}`, `{_2}` türünde bir eklentidir, dışa aktarma eklentisi değildir
 @msg	`{_1}` is an importer: open a file with document.open {{"importer"}"}}	`{_1}` bir içe aktarma eklentisidir: dosyayı document.open {{"importer"}"}} ile açın
 @msg	the importer returned no objects	içe aktarma eklentisi hiç nesne döndürmedi
 @msg	an importer returns `objects` and `warnings`, not `{key}`	içe aktarma eklentisi `{key}` değil, `objects` ve `warnings` döndürür
diff --git a/crates/ui-egui/src/i18n/uk.tsv b/crates/ui-egui/src/i18n/uk.tsv
index ac74a7404..18475a371 100644
--- a/crates/ui-egui/src/i18n/uk.tsv
+++ b/crates/ui-egui/src/i18n/uk.tsv
@@ -6090,7 +6090,8 @@ breakText	Glyphs	Гліфи
 @msg	missing `importer` (see document.formats)	не вказано `importer` (див. document.formats)
 @msg	`importer` must be a plug-in format id (see document.formats)	`importer` має бути ідентифікатором формату модуля (див. document.formats)
 @msg	“{shown}” opens {_1} files, not `{_2}`	«{shown}» відкриває файли {_1}, а не `{_2}`
-@msg	`{_1}` is a {_2}, not an importer	`{_1}` - це {_2}, а не модуль імпорту
+@msg	`{_1}` is a plug-in of kind `{_2}`, not an importer	`{_1}` є модулем виду `{_2}`, а не модулем імпорту
+@msg	`{_1}` is a plug-in of kind `{_2}`, not an exporter	`{_1}` є модулем виду `{_2}`, а не модулем експорту
 @msg	`{_1}` is an importer: open a file with document.open {{"importer"}"}}	`{_1}` - модуль імпорту: відкрийте файл за допомогою document.open {{"importer"}"}}
 @msg	the importer returned no objects	модуль імпорту не повернув жодного об’єкта
 @msg	an importer returns `objects` and `warnings`, not `{key}`	модуль імпорту повертає `objects` і `warnings`, а не `{key}`
diff --git a/crates/ui-egui/src/i18n/vi.tsv b/crates/ui-egui/src/i18n/vi.tsv
index 04c59cf6b..7491f1c22 100644
--- a/crates/ui-egui/src/i18n/vi.tsv
+++ b/crates/ui-egui/src/i18n/vi.tsv
@@ -6091,7 +6091,8 @@ breakText	Glyphs	Glyph
 @msg	missing `importer` (see document.formats)	thiếu `importer` (xem document.formats)
 @msg	`importer` must be a plug-in format id (see document.formats)	`importer` phải là id định dạng của một plug-in (xem document.formats)
 @msg	“{shown}” opens {_1} files, not `{_2}`	“{shown}” mở tệp {_1}, không phải `{_2}`
-@msg	`{_1}` is a {_2}, not an importer	`{_1}` là {_2}, không phải plug-in nhập
+@msg	`{_1}` is a plug-in of kind `{_2}`, not an importer	`{_1}` là plug-in loại `{_2}`, không phải plug-in nhập
+@msg	`{_1}` is a plug-in of kind `{_2}`, not an exporter	`{_1}` là plug-in loại `{_2}`, không phải plug-in xuất
 @msg	`{_1}` is an importer: open a file with document.open {{"importer"}"}}	`{_1}` là plug-in nhập: hãy mở tệp bằng document.open {{"importer"}"}}
 @msg	the importer returned no objects	plug-in nhập không trả về đối tượng nào
 @msg	an importer returns `objects` and `warnings`, not `{key}`	plug-in nhập trả về `objects` và `warnings`, không phải `{key}`
diff --git a/crates/ui-egui/src/i18n/zh-hans.tsv b/crates/ui-egui/src/i18n/zh-hans.tsv
index 188fafbac..3896cb184 100644
--- a/crates/ui-egui/src/i18n/zh-hans.tsv
+++ b/crates/ui-egui/src/i18n/zh-hans.tsv
@@ -6331,7 +6331,8 @@ breakText	Glyphs	字形
 @msg	missing `importer` (see document.formats)	缺少 `importer` (参见 document.formats)
 @msg	`importer` must be a plug-in format id (see document.formats)	`importer` 必须是增效工具的格式 ID (参见 document.formats)
 @msg	“{shown}” opens {_1} files, not `{_2}`	“{shown}” 打开的是 {_1} 文件，不是 `{_2}`
-@msg	`{_1}` is a {_2}, not an importer	`{_1}` 是 {_2}，不是导入增效工具
+@msg	`{_1}` is a plug-in of kind `{_2}`, not an importer	`{_1}` 是 `{_2}` 类型的增效工具，不是导入增效工具
+@msg	`{_1}` is a plug-in of kind `{_2}`, not an exporter	`{_1}` 是 `{_2}` 类型的增效工具，不是导出增效工具
 @msg	`{_1}` is an importer: open a file with document.open {{"importer"}"}}	`{_1}` 是导入增效工具：请用 document.open {{"importer"}"}} 打开文件
 @msg	the importer returned no objects	导入增效工具未返回任何对象
 @msg	an importer returns `objects` and `warnings`, not `{key}`	导入增效工具返回 `objects` 和 `warnings`，不是 `{key}`
diff --git a/crates/ui-egui/src/i18n/zh-hant.tsv b/crates/ui-egui/src/i18n/zh-hant.tsv
index 0e9326ec5..a4d3cbf72 100644
--- a/crates/ui-egui/src/i18n/zh-hant.tsv
+++ b/crates/ui-egui/src/i18n/zh-hant.tsv
@@ -6128,7 +6128,8 @@ breakText	Glyphs	字符
 @msg	missing `importer` (see document.formats)	未提供 `importer` (請參閱 document.formats)
 @msg	`importer` must be a plug-in format id (see document.formats)	`importer` 必須是增效模組的格式 ID (請參閱 document.formats)
 @msg	“{shown}” opens {_1} files, not `{_2}`	「{shown}」開啟的是 {_1} 檔案，不是 `{_2}`
-@msg	`{_1}` is a {_2}, not an importer	`{_1}` 是 {_2}，不是匯入增效模組
+@msg	`{_1}` is a plug-in of kind `{_2}`, not an importer	`{_1}` 是 `{_2}` 類型的增效模組，不是匯入增效模組
+@msg	`{_1}` is a plug-in of kind `{_2}`, not an exporter	`{_1}` 是 `{_2}` 類型的增效模組，不是匯出增效模組
 @msg	`{_1}` is an importer: open a file with document.open {{"importer"}"}}	`{_1}` 是匯入增效模組：請用 document.open {{"importer"}"}} 開啟檔案
 @msg	the importer returned no objects	匯入增效模組未傳回任何物件
 @msg	an importer returns `objects` and `warnings`, not `{key}`	匯入增效模組傳回 `objects` 和 `warnings`，不是 `{key}`
diff --git a/docs/plugins.md b/docs/plugins.md
index eb4537e17..9bae546a8 100644
--- a/docs/plugins.md
+++ b/docs/plugins.md
@@ -69,7 +69,10 @@ extensions with that importer (on the web, File › Open's picker opens instead)
 desktop the importer runs off the UI thread, and a run that takes a while shows a progress window with Cancel, which
 stops it. An importer
 with parameters, given no `params`, asks for them in a dialog of the same kind once the file is picked, and its Open
-button opens the file; File › Open runs an importer with its parameters' defaults. **File › Open** of a `.wasm` file installs
+button opens the file; File › Open runs an importer with its parameters' defaults. Open Recent opens a file the way
+File › Open does: it does not remember the importer or the parameters given to Open With. A built-in format reads the
+file if one can, and otherwise the first importer by id that lists its extension reads it with its parameters' defaults.
+**File › Open** of a `.wasm` file installs
 a plug-in too (on the web this is how plug-ins get in). A heavy filter asks before it is installed, and runs in the
 background ([below](#heavy-filters)). A plug-in that lists permissions asks for them before it is installed
 ([below](#permissions)).