Windows resets default apps to protect your system from malicious hijacking or due to outdated third-party software triggers. When an external app tries to change file associations through outdated or unauthorized registry paths, Windows flags it as a security threat and reverts the extensions to its factory defaults (like Microsoft Edge or Photos).
While there isn’t a single “off” switch due to Microsoft’s security protocols, you can stop this frustrating behavior using the proven methods below. 1. Change Associations Only via Windows Settings
The most common cause of resets is letting a third-party app change the association for you (e.g., clicking “Make Default” inside a third-party PDF reader). Windows views this registry injection as a potential exploit and instantly reverts it. Always set defaults through the official user interface: Press Win + I to open Settings. Click Apps, then choose Default apps.
Scroll down to your preferred program (e.g., Google Chrome, VLC, Adobe Acrobat) and click it.
Click Set default at the top, or individually click specific file types to manually map them. 2. Turn Off Recommended Default Management
Windows has built-in features designed to manage or prompt you about “recommended” apps, which can trigger automatic overrides after major system updates. Navigate to Settings > Apps > Default apps.
Look for the toggle labeled “Let Windows manage my default apps” (if available on your specific Windows build) and turn it Off. 3. Apply the “NoOpenWith” Registry Tweak
If a specific file extension (like .pdf or .html) reverts every time you restart, you can lock the “Open With” choice via the Registry Editor. Windows 10 keeps Resetting Default Apps to Edge
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