diff --git a/apps/filmcraft/src/main.rs b/apps/filmcraft/src/main.rs
index 3bb009ea..f850b163 100644
--- a/apps/filmcraft/src/main.rs
+++ b/apps/filmcraft/src/main.rs
@@ -447,11 +447,8 @@ fn run_dialog_off_thread(dialog: filmcraft_ui_egui::native_dialogs::FileDialog)
     let t = |s: &str| filmcraft_ui_egui::i18n::t(s).to_string();
     let media = t("Media");
     let project = t("FilmCraft Project");
-    let dialog = match dialog {
-        FileDialog::OpenFile { filter, exts } => FileDialog::OpenFile { filter: t(&filter), exts },
-        FileDialog::SaveAs { filter, exts, name } => FileDialog::SaveAs { filter: t(&filter), exts, name },
-        other => other,
-    };
+    let project_exts = project_patterns();
+    let dialog = prepare_dialog(dialog);
     let (tx, rx) = std::sync::mpsc::channel();
     let spawned = std::thread::Builder::new().name("file-dialog".into()).spawn(move || {
         let shown = std::panic::catch_unwind(move || {
@@ -462,9 +459,9 @@ fn run_dialog_off_thread(dialog: filmcraft_ui_egui::native_dialogs::FileDialog)
                 }
                 FileDialog::OpenFile { filter, exts } => rfd::FileDialog::new().add_filter(&filter, &exts).pick_file().map(path).into_iter().collect(),
                 FileDialog::Relink { exts, .. } => rfd::FileDialog::new().add_filter(&media, &exts).pick_file().map(path).into_iter().collect(),
-                FileDialog::OpenProject => rfd::FileDialog::new().add_filter(&project, &["fcproj"]).pick_file().map(path).into_iter().collect(),
+                FileDialog::OpenProject => rfd::FileDialog::new().add_filter(&project, &project_exts).pick_file().map(path).into_iter().collect(),
                 FileDialog::SaveProject { name } => {
-                    rfd::FileDialog::new().add_filter(&project, &["fcproj"]).set_file_name(name).save_file().map(path).into_iter().collect()
+                    rfd::FileDialog::new().add_filter(&project, &project_exts).set_file_name(name).save_file().map(path).into_iter().collect()
                 }
                 FileDialog::SaveAs { filter, exts, name } => {
                     rfd::FileDialog::new().add_filter(&filter, &exts).set_file_name(name).save_file().map(path).into_iter().collect()
@@ -492,6 +489,29 @@ fn run_dialog_off_thread(dialog: filmcraft_ui_egui::native_dialogs::FileDialog)
     rx
 }
 
+/// A dialog as the Linux dialog thread shows it: filter names translated (here, on the UI thread:
+/// the interface language is per thread) and every extension list turned into the
+/// case-insensitive patterns the synchronous pickers use, so `CLIP.MP4` stays visible (#262).
+#[cfg(target_os = "linux")]
+fn prepare_dialog(dialog: filmcraft_ui_egui::native_dialogs::FileDialog) -> filmcraft_ui_egui::native_dialogs::FileDialog {
+    use filmcraft_ui_egui::native_dialogs::FileDialog;
+    let t = |s: &str| filmcraft_ui_egui::i18n::t(s).to_string();
+    let patterns = |exts: Vec<String>| file_filters::extensions(&exts.iter().map(String::as_str).collect::<Vec<_>>());
+    match dialog {
+        FileDialog::OpenFiles { exts } => FileDialog::OpenFiles { exts: patterns(exts) },
+        FileDialog::OpenFile { filter, exts } => FileDialog::OpenFile { filter: t(&filter), exts: patterns(exts) },
+        FileDialog::SaveAs { filter, exts, name } => FileDialog::SaveAs { filter: t(&filter), exts: patterns(exts), name },
+        FileDialog::Relink { exts, hint } => FileDialog::Relink { exts: patterns(exts), hint },
+        other => other,
+    }
+}
+
+/// The project dialogs' filter patterns (`EDIT.FCPROJ` included).
+#[cfg(target_os = "linux")]
+fn project_patterns() -> Vec<String> {
+    file_filters::extensions(&["fcproj"])
+}
+
 #[cfg(test)]
 mod tests {
     /// Start-up registers the hardware decoders whether or not anything is logged (no logger is
@@ -505,4 +525,31 @@ mod tests {
             || (cfg!(target_os = "linux") && matches!(hardware, filmcraft_platform::Availability::Available(_)));
         assert_eq!(filmcraft_platform::registered(), expected, "{hardware:?}");
     }
+
+    /// #262 on Linux: the dialogs shown off the UI thread (#260) filter with the same
+    /// case-insensitive patterns as the synchronous pickers, so upper- and mixed-case files show.
+    #[cfg(target_os = "linux")]
+    #[test]
+    fn off_thread_dialogs_keep_case_insensitive_filters() {
+        use filmcraft_ui_egui::RelinkHint;
+        use filmcraft_ui_egui::native_dialogs::FileDialog;
+        let mp4 = || vec!["mp4".to_string()];
+        let hint = RelinkHint { command: "media.relink".into(), params: serde_json::json!({}) };
+        for dialog in [
+            FileDialog::OpenFiles { exts: mp4() },
+            FileDialog::OpenFile { filter: "Media".into(), exts: mp4() },
+            FileDialog::SaveAs { filter: "Media".into(), exts: mp4(), name: "clip.mp4".into() },
+            FileDialog::Relink { exts: mp4(), hint },
+        ] {
+            let exts = match super::prepare_dialog(dialog) {
+                FileDialog::OpenFiles { exts } | FileDialog::OpenFile { exts, .. } | FileDialog::SaveAs { exts, .. } | FileDialog::Relink { exts, .. } => exts,
+                other => panic!("the dialog changed kind: {other:?}"),
+            };
+            assert_eq!(exts.first().map(String::as_str), Some("mp4"), "the literal extension stays first (save suffix)");
+            assert!(exts.iter().any(|e| e == "[mM][pP]4"), "{exts:?}");
+        }
+        let project = super::project_patterns();
+        assert_eq!(project.first().map(String::as_str), Some("fcproj"));
+        assert!(project.iter().any(|e| e == "[fF][cC][pP][rR][oO][jJ]"), "{project:?}");
+    }
 }