At this moment all I can say is "works for me". I put some more comments into my previous post above, to clarify the usage and describe the common pitfalls.

I tested on my Windows 7 US English version both for command-line and graphical-user-interface passphrases. The program was used essentially unchanged to help an user who had to restore German Windows Vista backup into a replacement machine made for the US market (or an opposite, don't recall the details.)

Test it character by character, umlaut by umlaut, both command line and GUI, until you find what's wrong. Or just hire somebody to do that for you.