This is a list of software requirements needed to run StreetDeck.
This is a stickey in the StreetDeck FAQ sub-forum, you may find other information in the FAQ sub-forum that might be helpful as well.
While there is not a specification that the English version of Windows is necessary, the StreetDeck team has not (and will not) be able to test StreetDeck on every language version of Windows made. As Chuck mentioned, the Unicode characters are not currently supported in StreetDeck.
Marassa - can you please report back with your results on the G4? Has this issue been resolved once you changed the Unicode characters in the file path?