I have two AC3 files that I want to combine into one. Is there a way to do this or do I have to convert it to WAV or something? I tried searching the forums, but AC3 is too small a word to search for, or so it tells me.

Hiya M8,
Go into a dos prompt and do the following, it works a treat.
copy /b file.ac3+file2.ac3 final.ac3