When you insert CD into your Mac, you can see in "Finder" AIFF files on the CD.
It's non usual AIFF. And some AIFF compatible software can’t open it. It’s special format of AIFF named as AIFF/sowt or AIFF-C/sowt (more correct).
Distinguish between AIFF and AIFF/sowt in order of bytes of sample audio. Order bytes into AIFF/sowt like to WAV PCM.
All other these formats is same.
May be you hear that AIFF-C is lossy audio file format group. But AIFF-C/sowt is lossless.
AIFF-C/sowt has same to AIFF-C file header, but it is format compatible with Microsoft WAV PCM. That format used for storing audio data into CD.