GIMP 2.10.x Won't run under a directory with spaces in the name
Tested in multiple drives and folders. If the folder has a long name with spaces, the program will launch and close immediately. This behavior does not happen with any other program from PortableApps.com, that I use (and I use a lot of them).
I think it's the same bug this guy was experiencing!
EDIT.: I did the following tests: