Thanks!

The one I used seems to work fine. I was able to enhance it even more by using the "_chr()" function, so I can create the name of the folder in-game...

Code:
CreateDirectory(_chr(str_directory_name),0.000);


Previously, I was creating the folder right in the game folder, which is fine, until people start installing it on newer Windows machines. Then it seems to cause trouble.

See my games here: https://www.indiedb.com/company/michael-klaus-schmidt