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Windows 10 file "send to" and app's :mailto protocol not fully checked by Thunderbirds "Check for Default Client" option

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Windows 10 settings for default email app and default mailto protocol can be set to Thunderbird, but the "Email app.... not defined" dialog box still comes up. Regedit of HKEY_CURRENT_USER\Software\Clients\Mail value to "Mozilla Thunderbird" fixes.

Windows 10 settings for default email app and default mailto protocol can be set to Thunderbird, but the "Email app.... not defined" dialog box still comes up. Regedit of HKEY_CURRENT_USER\Software\Clients\Mail value to "Mozilla Thunderbird" fixes.

Modified by dquick1