OK it's a minor bug. We've fixed it now.
It's only visible if the following conditions are met:
1. you are executing a MS-DOS based program
2. the program resides on a FAT volume (not NTFS)
3. the path name of the program contains at least one non-English character (more precisely, a character thas is above 128 in the ASCII table).
Thanks for pointing this out, Le Doc. Given the 3 points above I wouldn't call this too serious but yeah, it was a bug.
Vlk