I tried numerous googlings, but found only software that isn't free.
I did this once, but I forgot how! What is the free app to do this?
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Is this what you're looking for?
Load up the file in Winamp, use the Disk Writer plugin, and write it to a WAV file on the hard drive. Then you can burn straight to a CD without converting from MP3 or anything.
Try 2Wav or IT to XM converter from here.