I have some 24-bit aif files I need to convert to wav. Whats the best way to do this via freeware programs, in batch mode? I thought foobar would do it for me but it doesn't seem to open .aif files.

http://www.borg.com/~jglatt/midi/software/aiff2wav.exe

It's a gui program, but there are instructions on how to run it from the command line in the help file.