sorry -- i meant "apple" when i said "mac" in other words, i want nothing to do with digidesign and want header info in resource --- (ive never heard about DSP Designer or MacMix except in SH saveAs .. are these commercial apps?) SND resources contain the actual sound data in resource as well, am i right? try again: anybody know if there is a standardized header (AIFF-C format chunk?) for B-format (ambisonics) sound files? -matt --- tom erbe wrote: >5) does anybody know of a mac file type that uses header info in reaource >fork? Digidesign, DSP Designer and MacMix (all pretty much the same format). And, of course, SND resource files.