MCMP contains compression info for WAV files and iMUS blocks in Grim Fandango. In this way, it corresponds to the COMP block of The Dig and CMI.

"MCMP"	dword	Block identifier
nEntries	word	Number of entries (BE)
loop nEntries
nCodec	byte	Codec Number - index of the codec name in the list below.
dwDecompSize	dword	Decompressed size (BE)
dwCompSize	dword	Compressed size (BE)
end of loop
nCodecs	word	Number of codecs in list (LE)
loop nCodecs
szCodecName	5 * char	Codec Name - null terminated string. In Grim Fandango this is either NULL (for uncompressed) or VIMA (for the Grim Fandango music compression)
end of loop