yes this is the problem .... i don't get a file .... but it states that the decrypting was successfull....strange.
Make sure you entered the file to be decrypted (myEncryptedFile.jar) and the directory path (e.g. /root). It should be in the selected directory. Maybe try a different directory if you're having some kind of overwrite problem.
until now no really working solution - seems strange to me. which solution did you use to carry single files on an usb stick an ready to decrypt it at customer side independent from the os???? i think java is the only solution.
looking for something the crypts a file test.odt to let's say test.odt.cry and decrypt it the same way back.