diff --git a/l4d2web/l4d2web/static/js/files-overlay.js b/l4d2web/l4d2web/static/js/files-overlay.js
index 8f30ce0..7f3e8eb 100644
--- a/l4d2web/l4d2web/static/js/files-overlay.js
+++ b/l4d2web/l4d2web/static/js/files-overlay.js
@@ -349,6 +349,13 @@
     editor.folder = folder;
     editor.queuedReplacement = null;
 
+    // Reset the language dropdown to "auto" on every modal open so the
+    // displayed value matches what setEditorContent does internally
+    // (which always calls setLanguage("auto")). Without this, a user
+    // who picked a manual override on a previous open would see the
+    // stale selection while the editor language follows the new file.
+    if (languageSelect) languageSelect.value = "auto";
+
     setEditorTitle(`${folder ? folder + "/" : ""}…new file`);
     editorEls.filename.value = "";
     editorEls.filename.disabled = false;
@@ -373,6 +380,9 @@
     editor.queuedReplacement = null;
     setQueuedReplacement(null);
 
+    // Reset the language dropdown — see openEditorTextNew for rationale.
+    if (languageSelect) languageSelect.value = "auto";
+
     editorEls.filename.value = basename(path);
     editorEls.filename.disabled = false;
     editorEls.renameHint.hidden = true;