I use a proprietary java application that works on both mac and windows. With the source files on my apple filesystem if I access the files and make a change with my java application through the mounted parallels drive on my windows guest os I am seeing file corruption. If I use a regular samba share and circumvent the parallels file sharing there is no file corruption. I am doing the Parallels 6 trial currently but it seems that if this is the case I won't be able to buy this software. I've found other forum posts about file corruption with Corel Draw: http://forum.parallels.com/showthread.php?t=99992 Apparently there was a patch that fixed this problem back in Parallels 5. I'm running the latest Parallels 6.