diff --git a/js/components/FileChooser.tsx b/js/components/FileChooser.tsx
index 648960b..500772b 100644
--- a/js/components/FileChooser.tsx
+++ b/js/components/FileChooser.tsx
@@ -12,17 +12,9 @@ const ACCEPT_EVERYTHING_TYPE: FilePickerAcceptType = {
     accept: { '*/*': [] },
 };
 
-export interface FileSystemFileHandleLike {
-    readonly name: string;
-    readonly kind: string;
-    readonly isWritable: boolean;
-    getFile(): Promise<File>;
-    createWritable: FileSystemFileHandle['createWritable'];
-}
-
 export interface FileChooserProps {
     disabled?: boolean;
-    onChange: (handles: Array<FileSystemFileHandleLike>) => void;
+    onChange: (handles: Array<FileSystemFileHandle>) => void;
     accept?: FilePickerAcceptType[];
     control?: typeof controlDefault;
 }
@@ -170,7 +162,7 @@ export const FileChooser = ({
 }: FileChooserProps) => {
 
     const onChangeForInput = useCallback((files: FileList) => {
-        const handles: FileSystemFileHandleLike[] = [];
+        const handles: FileSystemFileHandle[] = [];
         for (let i = 0; i < files.length; i++) {
             const file = files.item(i);
             if (file === null) {
@@ -180,25 +172,19 @@ export const FileChooser = ({
                 kind: 'file',
                 name: file.name,
                 getFile: () => Promise.resolve(file),
-                isWritable: false,
                 createWritable: (_options) => Promise.reject('File not writable.'),
+                queryPermission: (descriptor) => Promise.resolve(descriptor === 'read' ? 'granted' : 'denied'),
+                requestPermission: (descriptor) => Promise.resolve(descriptor === 'read' ? 'granted' : 'denied'),
+                isSameEntry: (_unused) => Promise.resolve(false),
+                isDirectory: false,
+                isFile: true,
             });
         }
         onChange(handles);
     }, [onChange]);
 
     const onChangeForPicker = useCallback((fileHandles: FileSystemFileHandle[]) => {
-        const handles: FileSystemFileHandleLike[] = [];
-        for (const fileHandle of fileHandles) {
-            handles.push({
-                kind: fileHandle.kind,
-                name: fileHandle.name,
-                getFile: () => fileHandle.getFile(),
-                isWritable: true,
-                createWritable: (options) => fileHandle.createWritable(options),
-            });
-        }
-        onChange(handles);
+        onChange(fileHandles);
     }, [onChange]);
 
     return control === 'picker'
diff --git a/js/components/FileModal.tsx b/js/components/FileModal.tsx
index 243bacb..1c99060 100644
--- a/js/components/FileModal.tsx
+++ b/js/components/FileModal.tsx
@@ -7,9 +7,9 @@ import DiskII from '../cards/disk2';
 import { ErrorModal } from './ErrorModal';
 
 import index from 'json/disks/index.json';
-import { FileChooser, FilePickerAcceptType, FileSystemFileHandleLike } from './FileChooser';
 import { noAwait } from './util/promises';
 import { useHash } from './hooks/useHash';
+import { FileChooser, FilePickerAcceptType } from './FileChooser';
 
 const DISK_TYPES: FilePickerAcceptType[] = [
     {
@@ -50,7 +50,7 @@ export const FileModal = ({ disk2, number, onClose, isOpen }: FileModalProps) =>
     const [busy, setBusy] = useState<boolean>(false);
     const [empty, setEmpty] = useState<boolean>(true);
     const [category, setCategory] = useState<string>();
-    const [handles, setHandles] = useState<FileSystemFileHandleLike[]>();
+    const [handles, setHandles] = useState<FileSystemFileHandle[]>();
     const [filename, setFilename] = useState<string>();
     const [error, setError] = useState<unknown>();
     const hash = useHash();
@@ -82,7 +82,7 @@ export const FileModal = ({ disk2, number, onClose, isOpen }: FileModalProps) =>
         setHashParts(hashParts);
     }, [disk2, filename, number, onClose, handles, hash]);
 
-    const onChange = useCallback((handles: FileSystemFileHandleLike[]) => {
+    const onChange = useCallback((handles: FileSystemFileHandle[]) => {
         setEmpty(handles.length === 0);
         setHandles(handles);
     }, []);
diff --git a/test/components/FileChooser.spec.tsx b/test/components/FileChooser.spec.tsx
index 7ffa95a..99d7c76 100644
--- a/test/components/FileChooser.spec.tsx
+++ b/test/components/FileChooser.spec.tsx
@@ -69,9 +69,9 @@ describe('FileChooser', () => {
                 const handle = handleList[0];
                 expect(handle.kind).toBe('file');
                 expect(handle.name).toBe(FAKE_FILE.name);
-                expect(handle.isWritable).toBe(false);
                 await expect(handle.getFile()).resolves.toBe(FAKE_FILE);
                 await expect(handle.createWritable()).rejects.toEqual('File not writable.');
+                await expect(handle.queryPermission({ mode: 'readwrite' })).resolves.toBe('denied');
             });
         });
     });
@@ -125,7 +125,6 @@ describe('FileChooser', () => {
                 const handle = handleList[0];
                 expect(handle.kind).toBe(FAKE_FILE_HANDLE.kind);
                 expect(handle.name).toBe(FAKE_FILE_HANDLE.name);
-                expect(handle.isWritable).toBe(true);
             });
         });
     });