The most recent update to the multimedia standards from MS is version 3.0 released in April 1994, and lists definitions for roughly 40 types of wave audio data. (refer to riffnew.doc in file mdrk.exe KB120253) The most recent version of mmreg.h I can find is version 1.57 and it lists more than 120 format types, HOWEVER, my installation of win2k doesn't recognize many of them--even format tags that windows 98 knows about! (BTW-the properties handler media information summary [under file properties] in win2k is crappy-not nearly as useful as the service under win98--the preview is missing too). Are there any documentation for the remaining types defined since early 1994? I need the data formats "byte-by-byte" for a number of new the wave_format types that look promising for new audio codecs. These are *supposed* to be supplied to Microsoft as part of the registration process (which doesn't seem to be available anymore). Recently, I've also seen even more new format tags listed in the file "Registered FOURCC Codes and WAVE Formats" in the 2003 SDK documentation, but it is still missing more formats such as the ogg-vorbis and gsm series listed elsewhere and existing in the 'wild'. Does Microsoft register these codecs anymore? There is no response from mmreg@xxxxxxxxxxxxx to any questions. Regards, James Dean National Research Council Ottawa, ON ****************** ****************** WDMAUDIODEV addresses: Post message: mailto:wdmaudiodev@xxxxxxxxxxxxx Subscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=subscribe Unsubscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=unsubscribe Moderator: mailto:wdmaudiodev-moderators@xxxxxxxxxxxxx URL to WDMAUDIODEV page: http://www.wdmaudiodev.de/