Lock
Set the app you want for each file extension.
macOS default app protection
Stop apps from taking over how your files open.
FileTypeGuard monitors file associations on macOS and restores your preferred app automatically when another app silently changes the default.
Common cases
- PDFs jump from Preview to Adobe Acrobat after an update.
- Markdown files suddenly open in Xcode again.
- Media players keep fighting over video file defaults.
How It Works
Lock. Monitor. Restore.
Monitor
Watch Launch Services changes continuously in the background.
Restore
Recover your preferred default as soon as another app changes it.
Features
Built for one practical macOS problem.
File type protection
Lock any extension to the app you prefer.
Automatic recovery
Revert unwanted changes within seconds.
Change history
See what changed and when restoration happened.
Notifications
Get system alerts when FileTypeGuard intervenes.
Visual picker
Browse common file types or enter your own extensions.
Multi-language UI
Now published in nine mainstream languages.
Product View
A lightweight interface that stays out of your way.
