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Windows 11 - attach files in all programs reverts to Outlook

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I am unable to attach/send files through other programs or windows - instead of Thunderbird the program will try to use Outlook.

Thunderbird is set as the default map in MAILTO in Windows settings.

This worked fine until recently - I think a windows or Office 365 update may have overriden something, but I cannot find any settings to change to attach and send through Thunderbird.

Any help or advice would be much appreciated

I am unable to attach/send files through other programs or windows - instead of Thunderbird the program will try to use Outlook. Thunderbird is set as the default map in MAILTO in Windows settings. This worked fine until recently - I think a windows or Office 365 update may have overriden something, but I cannot find any settings to change to attach and send through Thunderbird. Any help or advice would be much appreciated

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