Settings → Apps → Default apps → scroll to Reset — all file associations back to factory defaults in one click. Handy after an app install takes over.
Every file extension (.mp3, .jpg, .docx) is linked to a default app — and you can change any of them in Settings → Apps → Default apps.
Learn how to set default apps in Windows 11 without confusion. Customize your app preferences for browsing, email, PDFs, and more.