Network folders compressed=bad idea?

I think our Domain Admin decided a while ago to compress our network drives to save disk space.  I've seen people say this isn't good for SolidWorks files, but nothing as to WHY that is.  Anyone have good input on why and solid resource(s) on this subject so I can present him a "don't do that you idiot"?

Thanks,

Paul

SolidworksAdministration