diff --git a/app.js b/app.js
index 0f4b7b4..7b51a0b 100644
--- a/app.js
+++ b/app.js
@@ -1,5 +1,6 @@
 import * as FSHandle from "./store-directory-handle.js";
 
+/** @type {(type:string, attributes?:Record<string, string>, ...children:Array<string|HTMLElement>)=>HTMLElement} */
 const H =(type, attributes={}, ...children)=> {
   const el =document.createElement(type);
   Object.entries(attributes).forEach(([name, data])=>{
@@ -23,22 +24,37 @@ const H =(type, attributes={}, ...children)=> {
 const button = H("button");
 const listRoom = H("ul");
 
-/** @type {(handle:boolean)=>Promise<void>} */
-async function ReloadAndRedraw(handle)
+/** @type {(errorAction?:()=>void)=>Promise<void>} */
+async function ReloadAndRedraw(errorAction = ()=>{})
 {
-  if(handle)
+  listRoom.innerHTML = "";
+
+  try
   {
+    const handle = await FSHandle.getDirectoryHandle();
+    if(!handle)
+    {
+      console.log("no fs handle")
+      throw new Error("no fs handle set yet")
+    }
+    button.setAttribute("disabled", true);
+    button.innerText = "loading...";
     const module = await import("./data/room.js"+"?rand="+Math.random());
     const rooms = module.default();
     button.innerText = "change directory";
     console.log("rooms loaded:", rooms);
-    listRoom.innerHTML = "";
+
     Object.entries(rooms).forEach(([roomID, roomData])=>
     {
       const listPass = H("ul");
       Object.entries(roomData.Pass).forEach(([passID, passData])=>{
         listPass.appendChild(H("li", {}, 
-          H("button", { onclick(){ passData.load();console.log(roomData);globalThis.ROOM=roomData; } }, passData.name)
+          H("button", { onclick()
+            {
+              passData.load();
+              console.log(roomData);
+              globalThis.ROOM=roomData;
+            } }, passData.name)
         ))
       });
 
@@ -50,24 +66,22 @@ async function ReloadAndRedraw(handle)
       );
     })
   }
-  else
+  catch(e)
   {
+    errorAction();
     button.innerText = "select directory";
   }
+  button.removeAttribute("disabled")
 }
 
 
-let handle = false;
-handle = await FSHandle.getDirectoryHandle();
-await ReloadAndRedraw(handle);
+await ReloadAndRedraw();
 
 button.addEventListener("click", async()=>
 {
   const directory = await globalThis.showDirectoryPicker();
   await FSHandle.setDirectoryHandle(directory);
-
-  handle = await FSHandle.getDirectoryHandle();
-  await ReloadAndRedraw(handle);
+  await ReloadAndRedraw(()=>alert("Invalid directory"));
 });
 
 document.body.appendChild(button);
diff --git a/service-worker.js b/service-worker.js
index 64fcdbd..5650b18 100644
--- a/service-worker.js
+++ b/service-worker.js
@@ -4,7 +4,6 @@ self.addEventListener('install', ()=> self.skipWaiting()); // Activate worker im
 self.addEventListener('activate', ()=> self.clients.claim()); // Become available to all pages);
 self.addEventListener('fetch', (event) =>event.respondWith(Interceptor(event)));
 
-let handle = false;
 async function Interceptor(event)
 {
   const url = new URL(event.request.url);
@@ -13,43 +12,25 @@ async function Interceptor(event)
 
   if(parts[0] == "data" || parts[0] == "room")
   {
-    console.log("intercept", pathname)
-    const extension = pathname.substring(pathname.lastIndexOf('.') + 1);
-    // Intercept only JavaScript files
-    if ( extension == "js" || extension == "json" )
+    console.log("intercept:", pathname)
+    const handle = await FSAccess.getDirectoryHandle();
+    if(handle)
     {
-      if(!handle)
+      const file = await FSAccess.drilldown(handle, parts);
+      if(file)
       {
-        handle = await FSAccess.getDirectoryHandle();
-      }
-      if(handle)
-      {
-        try
-        {
-          let filePointer = handle;
-          for(let i=0; i<parts.length-1; i++)
-          {
-            filePointer = await filePointer.getDirectoryHandle(parts[i], {create: false});
+        const content = await file.text();
+        return new Response(content, {
+          headers: {
+            'Content-Type': 'application/javascript',
+            'Cache-Control': 'no-cache'
           }
-          filePointer = await filePointer.getFileHandle(parts[parts.length-1], {create: false});
-          const file = await filePointer.getFile();
-          const content = await file.text();
-
-          return new Response(content, {
-            headers: {
-              'Content-Type': 'application/javascript',
-              'Cache-Control': 'no-cache'
-            }
-          });
-        }
-        catch(e)
-        {
-          console.log("couldnt find it", pathname)
-          return fetch(event.request);
-        }
-  
+        });
       }
     }
+
+    console.log("couldnt find:", pathname);
+    return new Response("404", {status:404});
     
   }
   else
diff --git a/store-directory-handle.js b/store-directory-handle.js
index 95f1231..2e6e7d2 100644
--- a/store-directory-handle.js
+++ b/store-directory-handle.js
@@ -1,4 +1,5 @@
 // 📦 IndexedDB Helper
+/** @type {()=>Promise<IDBDatabase>} */
 function openDB() {
   return new Promise((resolve, reject) => {
     const request = indexedDB.open('directory-handle-db', 1);
@@ -11,19 +12,21 @@ function openDB() {
 }
 
 // 💾 Store a directory handle
+/** @type {(handle:FileSystemDirectoryHandle)=>Promise<void>} */
 export async function setDirectoryHandle(handle) {
   const db = await openDB();
   const tx = db.transaction('handles', 'readwrite');
-  tx.objectStore('handles').put(handle, 'my-folder');
+  tx.objectStore('handles').put(handle, 'user-folder');
   await tx.done;
 }
 
 // 📂 Retrieve a directory handle
+/** @type {()=>Promise<FileSystemDirectoryHandle|false>} */
 export async function getDirectoryHandle() {
   const db = await openDB();
   const tx = db.transaction('handles', 'readonly');
   return new Promise((resolve, reject) => {
-    const getRequest = tx.objectStore('handles').get('my-folder');
+    const getRequest = tx.objectStore('handles').get('user-folder');
     getRequest.onsuccess = () => resolve(getRequest.result);
     getRequest.onerror = () => {
       console.error('Error retrieving directory handle:', getRequest.error);
@@ -32,21 +35,40 @@ export async function getDirectoryHandle() {
   });
 }
 
-// 🔐 Check or request permission
-async function verifyPermission(handle, mode = 'readwrite') {
-  const opts = { mode };
-  if ((await handle.queryPermission(opts)) === 'granted') return true;
-  if ((await handle.requestPermission(opts)) === 'granted') return true;
-  return false;
+/** @type {(handle:FileSystemDirectoryHandle, parts:string[])=>Promise<File|false>} */
+export async function drilldown(handle, parts)
+{
+  try
+  {
+    let filePointer = handle;
+    for(let i=0; i<parts.length-1; i++)
+    {
+      filePointer = await filePointer.getDirectoryHandle(parts[i], {create: false});
+    }
+    const leaf = await filePointer.getFileHandle(parts[parts.length-1], {create: false});
+    return await leaf.getFile();    
+  }
+  catch(e)
+  {
+    return false
+  }
 }
 
-
-// 📌 Request persistent storage
-async function ensurePersistentStorage() {
-  if (navigator.storage && navigator.storage.persist) {
-    const granted = await navigator.storage.persist();
-    console.log(granted
-      ? '✅ Persistent storage granted.'
-      : '⚠️ Storage may be cleared under pressure.');
-  }
-}
\ No newline at end of file
+// // 🔐 Check or request permission
+// async function verifyPermission(handle, mode = 'readwrite') {
+//   const opts = { mode };
+//   if ((await handle.queryPermission(opts)) === 'granted') return true;
+//   if ((await handle.requestPermission(opts)) === 'granted') return true;
+//   return false;
+// }
+// 
+// 
+// // 📌 Request persistent storage
+// async function ensurePersistentStorage() {
+//   if (navigator.storage && navigator.storage.persist) {
+//     const granted = await navigator.storage.persist();
+//     console.log(granted
+//       ? '✅ Persistent storage granted.'
+//       : '⚠️ Storage may be cleared under pressure.');
+//   }
+// }
\ No newline at end of file