Since Winamp 5.31, Nullsoft has supplied a FLAC plugin with their Full install; nothing else is needed to get FLAC to play in Wnamp.
		
		Before Winamp 5.31 it was necessary to use our FLAC plugin.  If you have an older version of Winamp, our plugin is still available in the 
FLAC Installer for Windows.  The Winamp plugin should work for both Winamp2 and Winamp5.  All that is necessary is to copy 
in_flac.dll to the 
Plugins/ directory of your Winamp installation.  There is nothing else to configure.  Make sure to restart Winamp before trying to play any 
.flac files.