Final Fantasy XI (X360) scd encryption by bnnm at 1:01 PM EST on January 7, 2017
Maybe some experts out there can help out (not really needed, just for fun).

The game is using some early/simple .SCD header and the data seems encrypted.

I think it's XMA with a RIFF header and some kind of XOR'ing, and at 0x14 I suspect is the "key".
Several files use the same key and the first bytes would match a "RIFFxxxxWAVEfmt ....".
Also XMA typically end in series of 0xfffffff, which files with the same key encrypt consistently.

Some samples:
(full set at joshw)

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