diff --git a/src/lib/ae_events/ae_events__event_file.ts b/src/lib/ae_events/ae_events__event_file.ts
index 1650c694..28cc6919 100644
--- a/src/lib/ae_events/ae_events__event_file.ts
+++ b/src/lib/ae_events/ae_events__event_file.ts
@@ -539,7 +539,6 @@ export const properties_to_save = [
     'filename',
     'extension',
     'open_in_os',
-    'cfg_json',
     'lu_file_purpose_id',
     'lu_event_file_purpose_name',
     'file_purpose',
diff --git a/src/routes/events/[event_id]/(launcher)/launcher_file_cont.svelte b/src/routes/events/[event_id]/(launcher)/launcher_file_cont.svelte
index 00be4aa4..39a4278f 100644
--- a/src/routes/events/[event_id]/(launcher)/launcher_file_cont.svelte
+++ b/src/routes/events/[event_id]/(launcher)/launcher_file_cont.svelte
@@ -93,6 +93,14 @@ let open_file_status: null | string = $state(null);
 let open_file_status_message: null | string = $state(null);
 let open_file_error_detail: string | null = $state(null);
 
+let open_in_os_loading: boolean = $state(false);
+
+/** Reactive display override for this file — stored in $events_loc (localStorage) not in the backend. */
+const current_display_override = $derived.by(() => {
+    const overrides = (($events_loc.launcher as Record<string, unknown>)?.file_display_overrides ?? {}) as Record<string, string>;
+    return (overrides[event_file_id] ?? null) as 'extend' | 'mirror' | 'none' | null;
+});
+
 /** State for the native test mode debug popup */
 let test_mode_popup_open: boolean = $state(false);
 let test_mode_popup_data: Record<string, any> | null = $state(null);
@@ -135,7 +143,11 @@ function get_launch_profile(
         native_device?.launch_profiles ??
         null;
     const local_profiles = ($events_loc as any).launcher?.launch_profiles ?? null;
-    const display_override = file_obj?.cfg_json?.display_override ?? null;
+    // Display override is stored per-device in $events_loc — not in the backend (event_file has no JSON column).
+    // This is intentional: display mode is a room/device preference, not a global file property.
+    const launcher_kv = $events_loc.launcher as Record<string, unknown>;
+    const file_display_overrides = (launcher_kv?.file_display_overrides ?? {}) as Record<string, string>;
+    const display_override = (file_display_overrides[event_file_id] ?? null) as 'extend' | 'mirror' | 'none' | null;
 
     // open_in_os = 'win' routes to the Windows-variant profile for apps that have one.
     // These profiles target Windows PowerPoint / LibreOffice / Acrobat running via Parallels or CrossOver.
@@ -469,12 +481,11 @@ async function handle_open_file() {
         open_file_status_message = 'Downloading (Onsite Mode)...';
         open_file_error_detail = null;
 
+        // Append 'win' to the filename for extensions that have Windows file associations
+        // (pptx→pptxwin, ppt→pptwin, odp→odpwin, pdf→pdfwin). Must match WIN_EXTENSION_MAP.
+        const WIN_ONSITE_EXTS = ['pptx', 'ppt', 'odp', 'pdf'];
         let filename = event_file_obj.filename;
-        if (
-            (event_file_obj.extension === 'ppt' ||
-                event_file_obj.extension === 'pptx') &&
-            event_file_obj.open_in_os === 'win'
-        ) {
+        if (event_file_obj.open_in_os === 'win' && WIN_ONSITE_EXTS.includes(event_file_obj.extension)) {
             filename = event_file_obj.filename + 'win';
         }
 
@@ -620,7 +631,7 @@ function prevent_default<T extends Event>(fn: (event: T) => void) {
                 click={handle_open_file}>
                 {#snippet label()}
                     {@const file_id = event_file_obj.hosted_file_id}
-                    <span class="shrink border-r border-gray-400 pr-1 text-xs">
+                    <span class="shrink border-r border-surface-300-700 pr-1 text-xs">
                         {#await ae_promises[event_file_id]}
                             <LoaderCircle
                                 size="1em"
@@ -634,26 +645,28 @@ function prevent_default<T extends Event>(fn: (event: T) => void) {
                                 {/if}
                             </span>
                         {:then result}
+                            <span class=" font-mono">
                             {#if is_url}
-                                <Link2 size="1em" class="mx-0.5 inline {!is_online ? 'text-warning-500' : ''}" />
-                                <span class:text-warning-500={!is_online}>url</span>
-                                {#if !is_online}<WifiOff size="0.85em" class="mx-0.5 inline text-warning-500" title="Network offline" />{/if}
+                                <Link2 size="1em" class="inline opacity-50 {!is_online ? 'text-warning-900-100' : ''}" />
+                                <span class:text-warning-900-100={!is_online}>url</span>
+                                {#if !is_online}<WifiOff size="0.85em" class="inline text-warning-900-100" title="Network offline" />{/if}
                             {:else}
                                 {@const FileIcon =
                                     ae_util.file_extension_icon_lucide(
                                         event_file_obj.extension
                                     )}
-                                <FileIcon size="1em" class="mx-0.5 inline" />
+                                <FileIcon size="1em" class="inline opacity-50" />
                                 {event_file_obj.extension}
                                 {#if result === null || result === false}
-                                    <span class="text-error-500"
+                                    <span class="text-error-900-100"
                                         ><TriangleAlert
                                             size="1em"
-                                            class="mx-1 inline" />Failed!</span>
+                                            class="inline" />Failed!</span>
                                 {/if}
                             {/if}
+                            </span>
                         {:catch error}
-                            <span class="text-error-500" title={error?.message}
+                            <span class="text-error-900-100" title={error?.message}
                                 ><AlertCircle
                                     size="1em"
                                     class="mx-0.5 inline" />Error!</span>
@@ -687,79 +700,71 @@ function prevent_default<T extends Event>(fn: (event: T) => void) {
         <button
             type="button"
             onclick={async () => {
-                let new_val: string | null;
-                if (!event_file_obj?.open_in_os) new_val = 'win';
-                else if (event_file_obj?.open_in_os == 'win') new_val = 'mac';
-                else new_val = null;
-                await api.update_ae_obj({
-                    api_cfg: $ae_api,
-                    obj_type: 'event_file',
-                    obj_id: event_file_id,
-                    fields: { open_in_os: new_val }
-                });
-                events_func.load_ae_obj_id__event_file({
-                    api_cfg: $ae_api,
-                    event_file_id: event_file_obj?.event_file_id,
-                    log_lvl
-                });
-            }}
-            class="btn btn-sm group transition-all"
-            class:preset-tonal-warning={event_file_obj?.open_in_os == 'win'}
-            class:preset-tonal-success={event_file_obj?.open_in_os == 'mac'}
-            disabled={!$ae_loc.trusted_access}
-            title={`Open in OS: ${
-                event_file_obj?.open_in_os
-                    ? event_file_obj.open_in_os.toUpperCase()
-                    : 'None'
-                }`}
-            >
-            {#if event_file_obj?.open_in_os == 'win'}
-                <!-- <Monitor
-                    size="1em"
-                    class="m-1" /> -->
-                Win
-            {:else if event_file_obj?.open_in_os == 'mac'}
-                <!-- <Laptop
-                    size="1em"
-                    class="m-1" /> -->
-                Mac
-            {:else}
-                <FolderOpen size="1em" class="m-1" />
-                {/if}
-        </button>
-
-        {#if $ae_loc.trusted_access}
-            <!-- Display override: per-file display_mode override for this file only.
-                 null = use profile default, 'extend' = force extend, 'mirror' = force mirror.
-                 Stored in event_file.cfg_json.display_override. Cycles null → extend → mirror → null.
-                 Settable from any device — takes effect when the file is opened in native mode. -->
-            <button
-                type="button"
-                onclick={async () => {
-                    const cur = event_file_obj?.cfg_json?.display_override ?? null;
-                    const next: string | null = !cur ? 'extend' : cur === 'extend' ? 'mirror' : null;
-                    const new_cfg = { ...(event_file_obj.cfg_json ?? {}), display_override: next };
-                    // Optimistic update — don't wait for the liveQuery round-trip
-                    event_file_obj = { ...event_file_obj, cfg_json: new_cfg };
+                open_in_os_loading = true;
+                try {
+                    let new_val: string | null;
+                    if (!event_file_obj?.open_in_os) new_val = 'win';
+                    else if (event_file_obj?.open_in_os == 'win') new_val = 'mac';
+                    else new_val = null;
                     await api.update_ae_obj({
                         api_cfg: $ae_api,
                         obj_type: 'event_file',
                         obj_id: event_file_id,
-                        fields: { cfg_json: new_cfg }
+                        fields: { open_in_os: new_val }
                     });
                     events_func.load_ae_obj_id__event_file({
                         api_cfg: $ae_api,
                         event_file_id: event_file_obj?.event_file_id,
                         log_lvl
                     });
+                } finally {
+                    open_in_os_loading = false;
+                }
+            }}
+            class="btn btn-sm group transition-all"
+            class:preset-tonal-warning={event_file_obj?.open_in_os == 'win'}
+            class:preset-tonal-success={event_file_obj?.open_in_os == 'mac'}
+            disabled={!$ae_loc.trusted_access || open_in_os_loading}
+            title={`Open in OS: ${
+                event_file_obj?.open_in_os == 'win' ? 'Windows' : event_file_obj?.open_in_os == 'mac' ? 'macOS' : event_file_obj?.open_in_os == 'linux' ? 'Linux' : '--not set--'
+            }`}
+            >
+            {#if open_in_os_loading}
+                <LoaderCircle size="1em" class="m-1 animate-spin" />
+            {:else if event_file_obj?.open_in_os == 'win'}
+                Win
+            {:else if event_file_obj?.open_in_os == 'mac'}
+                Mac
+            {:else}
+                <FolderOpen size="1em" class="m-1" />
+            {/if}
+        </button>
+
+        {#if $ae_loc.edit_mode}
+            <!-- Display override (temporary — local/device only, stored in $events_loc).
+                 Cycles null → extend → mirror → null. Instant write, no API call.
+                 TODO: replace with backend cfg_json once event_file gains a JSON column. -->
+            <button
+                type="button"
+                onclick={() => {
+                    const cur = current_display_override;
+                    const next: 'extend' | 'mirror' | null = !cur ? 'extend' : cur === 'extend' ? 'mirror' : null;
+                    const launcher = $events_loc.launcher as Record<string, unknown>;
+                    const new_overrides = { ...((launcher?.file_display_overrides ?? {}) as Record<string, string>) };
+                    if (next === null) {
+                        delete new_overrides[event_file_id];
+                    } else {
+                        new_overrides[event_file_id] = next;
+                    }
+                    launcher.file_display_overrides = new_overrides;
                 }}
                 class="btn btn-sm transition-all"
-                class:preset-tonal-primary={event_file_obj?.cfg_json?.display_override === 'extend'}
-                class:preset-tonal-warning={event_file_obj?.cfg_json?.display_override === 'mirror'}
-                title={`Display override: ${event_file_obj?.cfg_json?.display_override ?? 'default'}`}>
-                {#if event_file_obj?.cfg_json?.display_override === 'extend'}
+                class:preset-tonal-primary={current_display_override === 'extend'}
+                class:preset-tonal-warning={current_display_override === 'mirror'}
+                title={`Display override: ${current_display_override ?? 'default'}`}>
+                {#if current_display_override === 'extend'}
                     Ext
-                {:else if event_file_obj?.cfg_json?.display_override === 'mirror'}
+                {:else if current_display_override === 'mirror'}
                     Mir
                 {:else}
                     <Monitor size="1em" class="m-1" />
@@ -769,8 +774,13 @@ function prevent_default<T extends Event>(fn: (event: T) => void) {
 
         <span
             class="event_file_created_on preset-filled-surface-100-900 flex w-24 flex-row items-center justify-end gap-1 rounded px-1 py-0.5 text-center text-xs md:w-44"
-            class:hidden={hide_created_on}>
-            <CalendarDays size="0.85em" class="inline" />
+            class:hidden={hide_created_on}
+            title={`Created on:\n${ae_util.iso_datetime_formatter(
+                event_file_obj.created_on,
+                'datetime_long'
+            )}`}
+            >
+            <CalendarDays size="0.85em" class="inline opacity-50" />
             <span class="w-18"
                 >{ae_util.iso_datetime_formatter(
                     event_file_obj.created_on,
@@ -780,8 +790,10 @@ function prevent_default<T extends Event>(fn: (event: T) => void) {
 
         <span
             class="event_file_size preset-filled-surface-100-900 flex min-w-20 w-22 max-w-28 flex-row items-center justify-end gap-1 rounded py-0.5 text-center text-xs"
-            class:hidden={hide_size}>
-            <Save size="0.85em" class="inline" />
+            class:hidden={hide_size}
+            title={`File size:\n${event_file_obj.file_size ? ae_util.format_bytes(event_file_obj.file_size) : 'Unknown size'}\nBytes: ${event_file_obj.file_size}`}
+            >
+            <Save size="0.85em" class="inline opacity-50" />
             {#if event_file_obj.file_size}{ae_util.format_bytes(
                     event_file_obj.file_size
                 )}{/if}