Thank you very much!
I set it up yesterday and it works great, even with the portable version on a different drive. (I was surprised about that. Normally Windows 10 prevents wide systemic changes that don't come from Windows internal folders.) Just make sure you change the paths in the .config and .reg file before double clicking the reg file.
Notice that the files specified in each are different: The .config file refers to Freecommander.exe and the .reg file refers to FC_CP_Explorer_Wrapper.exe. Change the path correctly.
Also, notice I am not referring to the Portableapps .paf version, just the regular .zip version of
FreecommanderXE that keeps its settings in its own launch folder. The portableapps version has a different executable, FreecommanderPortable.exe, that may or may not work with this little helper application. I don't know.
FYI: I am on:
Win10 Pro 2004 as Administrator
FreecommanderXE_x64 845 for Donors in portable mode