How to Fix Default Apps Keep Resetting on Windows
Windows keeps changing your default browser, media player, or PDF viewer back to Microsoft apps? Fix default app association resets after updates.
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Main Troubleshooting Guide
How to Fix Windows Update Errors →Complete symptoms, causes, and step-by-step solutions
Symptoms
You might be experiencing this problem if you notice:
- •Default browser resets to Edge after Windows Update
- •PDF files open in Edge instead of your chosen app
- •Music/video files revert to Windows Media Player
- •"An app default was reset" notification appears
- •File type associations keep changing
- •Custom default apps not sticking after restart
Common Causes
- âš Windows Update overriding app defaults
- âš App not properly registering as default handler
- âš UserChoice registry hash invalidated
- âš Microsoft Edge policies forcing defaults
- âš Third-party app not setting associations correctly
- âš Corrupted default app database
Solutions
Solution 1: Set Default Apps Properly
- 1Go to Settings > Apps > Default apps
- 2Click the app you want as default (e.g., Chrome, Firefox)
- 3Click "Set default" at the top to set it for ALL supported file types
- 4Or: scroll down to set specific file types (.pdf, .html, etc.)
- 5For each file type, click the current app and select your preferred one
Solution 2: Set Defaults by File Type
- 1Go to Settings > Apps > Default apps
- 2Scroll to the bottom and click "Choose defaults by file type"
- 3Find extensions like .pdf, .html, .htm, .mp4, .mp3
- 4Click each and select your preferred app
- 5This is more reliable than the per-app method for stubborn file types
Solution 3: Prevent Edge from Reclaiming Defaults
- 1Open Edge and go to edge://settings/defaultBrowser
- 2Turn OFF "Let Microsoft Edge try to become the default"
- 3If using Group Policy: Computer Configuration > Admin Templates > Windows Components > File Explorer
- 4Enable "Do not show the 'new application installed' notification"
- 5This prevents the "An app default was reset" behavior
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