The most recent update to the multimedia standards is version 3.0 released in April 1994, and lists definitions for roughly 40 types of wave audio data. (refer to riffnew.doc in mdrk.exe q120253) The most recent version of mmreg.h I can find is version 1.57 and it lists more than 120 format types, HOWEVER, my recent installation of win2k doesn't recognize many of them--even format tags that windows 98 knows about! (BTW-the 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). 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/