If I use gpgex to encrypt/decrypt a file with a german umlaut, there comes a GPA
Error "Invalied argument". After renaming the file the encrpyt/decrypt completes
without error. I did install GPG4win 2.2.1 on Windows 7 Professional 32 bit.
This error comes also if an umlaut is in the directory strukture included.
Here you can copy some ä ö ü ß