<file_extension> Key
Associates a file name extension with a ProgID.
Registry Entry
HKEY_LOCAL_MACHINE\SOFTWARE\Classes
.ext = ProgID
Remarks
The information contained in the file name extension key is used by both the Windows Explorer and file monikers. GetClassFile uses the file name extension key to supply the associated CLSID.
The HKEY_LOCAL_MACHINE\SOFTWARE\Classes key corresponds to the HKEY_CLASSES_ROOT key, which was retained for compatibility with earlier versions of COM.
Related topics
Feedback
https://aka.ms/ContentUserFeedback.
Coming soon: Throughout 2024 we will be phasing out GitHub Issues as the feedback mechanism for content and replacing it with a new feedback system. For more information see:Submit and view feedback for