Yeah that is a messed up environment mixing elf and windows binaries. There is no which on windows. It is called where. So if your terminal is able to execute which then this is some kind of Linux environment on Windows. The winpty error comes from the terminal. Please use cmd.exe for all tests.

Thanks for opening the ticket. I looked at it when it was reported in the forum, But had no test build at hand to test a fix. If you look at the history of g4wihelp.c you can see how other functions have been ported to Unicode recently. The change is that the strings in the nsis script world have changed to two byte strings. The problem is then where the c code interacts with the NSIS script obtaining parameters and setting return values. Since the popstackna takes an ascii string it only takes the first character as the second byte is null. Changing these occurrences to popstackn and the setuservariable to widechar should do the trick.

I had T3840 assigned to me related to the Qt parts. I close that now as duplicate. But I don't see that we ever added a call of gpgrt_w32_override_locale to kleopatra or gpgol either. Which I assume to be the fix for T7454