schmid.dk/music/flac

'flac' is a lossless audio file format. 'flac' files roughly take up half the space of an uncompressed audio file, but retain the full sound quality of the uncompressed file. Therefore, 'flac' files will always have better sound quality than corresponding mp3 files, at the expense of larger file sizes.

Winamp 5.31 and newer plays 'flac' files out of the box. Also check out the official flac site.