The Silent File Scanner
In Windows 10, the “Let apps access my file system” setting is one of the most powerful and potentially dangerous privacy controls available. Unlike specific permissions that limit an app to your Pictures or Documents folders, this master toggle grants Universal Windows Platform (UWP) apps from the Microsoft Store sweeping access to all of your files. This includes everything in your user directory, external hard drives, network attached storage (NAS), and even cloud sync folders.
While a dedicated file manager app, an antivirus scanner, or a comprehensive backup utility absolutely requires this level of system-wide access to function, the vast majority of applications do not. A game, a calculator, or a streaming app has no legitimate reason to index your entire hard drive. If this setting is left enabled indiscriminately, a malicious or overly intrusive app could silently scan your drive for sensitive financial documents, private SSH keys, or personal photos without ever triggering a secondary prompt. To enforce the principle of least privilege and protect your data from unwarranted indexing, you should disable this broad access and force apps to request files one by one via the standard Windows file picker.
How to Block File System Access
You can instantly revoke system-wide file access for all Microsoft Store applications via the Privacy settings.
- Click the Start button and select the Settings gear icon (or press
Win + I). - Click on the Privacy category.
- Look at the left-hand sidebar, scroll down to the “App permissions” section, and click on File system.
- In the right-hand pane, look for the text Allow apps to access your file system.
- Immediately underneath this text, you will find a master toggle switch. Click the toggle switch to turn it Off.
Once disabled, Windows will block all UWP apps from arbitrarily browsing your hard drive. If an app needs a file, you will have to manually open it using the “File Open” dialog box, ensuring you always maintain manual control over your data.