@datjomp & toxaris: the files you are playing around with are based on J2ME. Even if you open your files on a pc, you would get an almost similar error, unless you have some form of J2ME emulator installed. Check out these links for a Java ME solution for N900: http://talk.maemo.org/showthread.php?t=52898 http://talk.maemo.org/showthread.php?t=37799 (I have not used any of these myself...)