Problem with registry setting default e-mail client

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In Windows 10, I was using Outlook (desktop) as my default e-mail client. I then changed the default app to "Thunderbird" When I look in the registry (Current User | Software | Clients | Mail) it still shows "Microsoft Outlook" as the default mail app. This is affecting how our Not-for-profit management system is working. Does anybody know how to correctly set the default email app?

What I have tried:

i changed from default app in windows settings

Posted 20-Apr-22 23:56pm

Venkata Padma

Updated 21-Apr-22 0:19am

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Richard Deeming · Answer 1 · 2022-04-21T00:19:00

There's a good explanation of the registry settings for the default mail client in this thread:
Where Windows 10 stores default email app in its registry - Super User[^]

Essentially, you need to start with the SOFTWARE\Classes\mailto key under HKCU/HKLM, but there are other keys which can override this:

SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\FileExts\mailto
SOFTWARE\Microsoft\Windows\Roaming\OpenWith\UrlAssociations\mailto
SOFTWARE\Microsoft\Windows\Shell\Associations\UrlAssociations\mailto