Ha!
I stuck with it a little longer and finally figured out. For the ME3 demo, The search criteria needs to be RIFF and the byte order should be Little Endian. With the output file extension as .wwise. This extracts correctly. ww2ogg is working fine as well.

Hi, I wanted to reopen this topic if I may. I have gone through all of the steps listed, but I have not had any success extracting the .afc files as described. I was thinking perhaps something has changed in the files in between the Beta and the release of the official Demo. Just to recap what I am ...