Fix error when changing TMC data path on Windows

CONTRIBUTING.md

@@ -42,12 +42,18 @@ Update the `tmc-python-tester` submodule
 git submodule init && git submodule update
 ```
 
-Repeat the same for the testing backend:
+Then prepare the backend:
 
 ```bash
 cd backend && npm ci && npm run setup
 ```
 
+As well as the webview:
+
+```bash
+cd webview && npm ci
+```
+
 You will need to rerun the setup when langs is updated, as this step will download the appropriate version of the CLI for the integration tests.
 
 ## Formatting

src/commands/changeTmcDataPath.ts

@@ -18,8 +18,9 @@ export async function changeTmcDataPath(actionContext: ActionContext): Promise<v
         canSelectFolders: true,
         canSelectMany: false,
         openLabel: "Select folder",
-        defaultUri: vscode.Uri.parse(old),
+        defaultUri: vscode.Uri.file(old),
     };
+
     const newPath = (await vscode.window.showOpenDialog(options))?.[0];
     if (newPath && old) {
         const res = await dialog.progressNotification(