Make sure the third-party programs you’re using comply with the rules of Windows 10. On Windows 10 versions that have Microsoft Edge (Chromium) built-in, then “ MSEdgePDF” ProgID will be the default handler for PDF files. htm/.html files, as seen in the registry. AppX4hxtad77fbk3jkkeerkrm0ze94wjf3s9 is the Microsoft Edge ProgID for. htm file type association was reset in the above example, and Microsoft Edge is now the default handler for the file type. User choice has been reset to prog id AppX4hxtad77fbk3jkkeerkrm0ze94wjf3s9 for. Log Name: Microsoft-Windows-Shell-Core/AppDefaults
The user will see the An App default was reset notification.Īfter you get the notification, if you open the Event Viewer and go to Microsoft-Windows-Shell-Core/AppDefaults event log, you’ll see which file type association was recently reset. If a (legacy) application doesn’t use Windows API and writes to the registry to set the file associations, Windows 10 detects that the registry (“UserChoice” key) is corrupted and will reset the fail-safe Windows default program for this file extension. Instead, the application should redirect the user to the Default apps window. In Windows 10, applications must not create or overwrite the ProgID value in the following registry key directly: HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\ in the above registry path refers to the file extension. Since the UserChoice → ProgID hash algorithm is in place in Windows 10, incorrect modification of file associations in the registry would cause Windows 10 to reset the association settings to defaults. The app defaults are reset by Windows 10 if it finds that an incompatible third-party program making changes to file associations directly, rather than directing users to the Default Apps window.
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