Hey folks,
Im on Windows 7 64 bits and would like to convert all my WAv/AIFF files to FLAC's.
Why?
I need tag writing etc. so therefore 
Thanks in advance 
have you tried iDealshare VideoGo? it can fast and batch convert aiff to flac, wav, mp3, ogg, wma, ac3, ape and etc
it has both windows version and mac version
besides converting aiff, it also hellps to convert wav, wma, flac, ape, dts, ogg, m4a and etc
step by step guide at
http://www.idealshare.net/aiff-to-mp3-converter.html