Hi, I actually followed the instructions and it all works fine until I try to register fobs4jmf jar files using jmstudio. In fact, it works when i open runjmstudio.bat. The movie is played fine, jars are correctly registered ... but when I close it and I open jmstudio again it fails and I get the error : "Failed to realize: input media not supported: XVID video, mpgelayer3 audio" plus codecs, demultiplexer ... are not registered anymore. When I try to add them manually I get the error : "Could not add Item". It only works for the package but neither for the demultiplexer nore the codecs. Hope someoneone would be able to help me solving this. Thx a lot ...