How to get the OpenWith list from the Registry?

Question

This Windows Registry Key:

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts

...supposedly contains the file extensions registered with Windows Explorer.

I try to programmatically read the OpenWith list for specific file extensions.

So I started with the .RES file extension: This key supposedly should contain the OpenWith list for the .res extension:

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\\.res\OpenWithList

This is how it looks in the Registry:

However, the OpenWith list for .res files in Windows Explorer looks completely different:

So how can I get the real OpenWith list for a specific file extension from the Registry?

Windows 7 x64 SP1

I think you can find solution in this page: [How to associate a file extension to a program without making it the default program](https://stackoverflow.com/questions/2956122/how-to-associate-a-file-extension-to-a-program-without-making-it-the-default-pro) — , Oct 14 '18 at 23:53

score 0 · Answer 1 · edited Oct 15 '18 at 00:42

key HKLM/SOFTWARE/Microsoft/Windows/CurrentVersion/App Paths/<progname>: "" = <appPath>

key HKCR/Applications/<progname>/SupportedTypes: <fileExt> = ""
key HKCR/<fileExt>: "" = <progID>

key HKCR/<progID>/OpenWithList/<progName>
key HKCR/<fileExt>/OpenWithList/<progName>
key HKCR/SystemFileAssociations/<fileExt>/OpenWithList/<progName>

Delete key and subkey at:

HKCU/SOFTWARE/Microsoft/Windows/CurrentVersion/Explorer/fileExts/<fileExt>

This key form How to associate a file extension to a program without making it the default program

How to get the OpenWith list from the Registry?

1 Answers1