On WinXP SP2 the illuminable DS filters for FLAC do not work. I have tried them several times on four computers. I am a C/C++ driver and app developer for Windows, but I don't have much experience with multimedia stuff or with DirectShow. I tried to get help from illuminable. On the other hand, the Matroska pack http://packs.matroska.org/ includes filters for FLAC that DO work. The only problem with them is that they don't register the types. So I suggest that users who want to play FLAC on Windows XP try the Matroska pack instead of illuminable. I have no involement with either project. Tom.