Running Enigmail/ Thunderbird with "runas" and user priviliges...

[karnin]

Tb-60.3.1 + Enigmail-2.0.8 + GnuPG-2.2.11 (win7prof):

Hello,
usually i am running my system with admin privileges, but for security reasons all programs accessing internet are started as normal user with runas /profile /user:name program.exe or AHK-macros.
It works since year, including Firefox, Ms-Outlook, IE, Newsletters and so on.

But while attempting runas /profile /user:name thunderbird.exe Enigmail reclaims gpg.exe 'not found'...
If selecting gpg.exe with overwriting, it is also not recognized.
Same if admin privileges are granted for this user account, so it seems to be not dependend on file access right.

So how to start Tb+Enigmail in such a setup?

Thanks + regards!