diff --git a/Viewer/features/filesystem.js b/Viewer/features/filesystem.js
index afd13d2b..328ed29c 100755
--- a/Viewer/features/filesystem.js
+++ b/Viewer/features/filesystem.js
@@ -239,7 +239,8 @@ var FileSystemLoaderActions = actions.Actions({
 		// NOTE: this will not match "dot filenames", this is done 
 		// 		intentionally to avoid the previews MAC computers 
 		// 		generate all over the place...
-		'image-file-pattern': '*.@(jpg|jpeg|png|svg|JPG|JPEG|PNG|SVG)',
+		// XXX make this case-agnostic...
+		'image-file-pattern': '*.@(jpg|jpeg|png|svg|gif|JPG|JPEG|PNG|SVG|GIF)',
 
 		'image-file-read-stat': true,
 		'image-file-skip-previews': false,
diff --git a/Viewer/package-lock.json b/Viewer/package-lock.json
index 88ef54c4..8eb2faef 100644
--- a/Viewer/package-lock.json
+++ b/Viewer/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "ImageGrid.Viewer.g4",
-  "version": "4.0.10a",
+  "version": "4.0.11a",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "ImageGrid.Viewer.g4",
-      "version": "4.0.10a",
+      "version": "4.0.11a",
       "dependencies": {
         "app-module-path": "*",
         "async-json": "0.0.2",