thanks to the TTD for the info:
How can I listen to the lossless files that I downloaded?
The Trader's Den limits lossless file trading to file formats that are usable across the three major computer platforms, Linux, Windows, and Macintosh. If you've downloaded a lossless audio fileset from SR, it will be in either FLAC, SHN, or APE format as these are the only formats with broad cross-platform support.
Please note that if you choose to burn this music to an audio CD that you should always keep backups of the ORIGINAL lossless files, exactly as you recieved them. There are errors that can occur during CD burning and ripping which alter the audio. To keep the music as pure as possible always keep a data CD, data DVD, or backup hard drive with the original files and md5/ffp checksums for trading. Burn to audio CD, compress to lossy formats, etc only for personal use. Never trade or give to someone else CDs burned from lossless files or files compressed to lossy formats as it pollutes the trading pool.
Here's a lost of some of the more popular ways that traders play back their lossless audio files.
Winamp (PC)
foobar2000 (PC)
Pure Audio (Macintosh)
MacAmp (Macintosh)
Audio CD