New installers for some of the Windows only Sierra games are being developed to make them playable on new PCs. Jafa is mostly doing the later, Windows only games. The SCI32 should be playable on 64 bit Windows with these installers. Check them out:

http://www.squirtthecat.com/

He has done a couple that have DOS interpreters that the Windows version has nothing over the DOS. If I had my druthers, I would rather have DOS versions of the Windows only games. This way when Windows 7 comes out and breaks backwards compatibility, only SDL and DOSBox will need to be ported to keep these games playable. But it is still nice to have these installers.