FLAC stands for Free Lossless Audio Codec. Grossly oversimplified, FLAC is similar to MP3, but lossless.

There are many small improvements, notably: Vorbis comment and id3v1/v2 support in the plugins, bug fixes for 24-bit handling, x86 encoder and decoder speedups, reduced memory requirements

Download Freeware FLAC 1.0.4 for Windows 9x/Me/NT/2000/XP