diff --git a/package.json b/package.json
index e3ecae9..fc5274f 100644
--- a/package.json
+++ b/package.json
@@ -280,6 +280,21 @@
         }
       ]
     },
+    "languages": [
+      {
+        "id": "json",
+        "extensions": [
+          ".jres",
+          ".g.jres"
+        ]
+      },
+      {
+        "id": "html",
+        "extensions": [
+          ".blocks"
+        ]
+      }
+    ],
     "configuration": {
       "title": "MakeCode Arcade",
       "properties": {
diff --git a/src/web/assetEditor.ts b/src/web/assetEditor.ts
index 639af9f..de7c636 100644
--- a/src/web/assetEditor.ts
+++ b/src/web/assetEditor.ts
@@ -284,6 +284,10 @@ async function saveFilesAsync(files: {[index: string]: string}) {
 
     await writeFileAsync("./pxt.json", JSON.stringify(parsed, null, 4), "utf8");
     await syncJResAsync();
+
+    if (didChangeConfig) {
+        await vscode.commands.executeCommand("workbench.files.action.refreshFilesExplorer");
+    }
 }
 
 /**