I've finally managed to disable the nightmare of file associations between Parallels and Windows and on the Mac it was relatively easy to get rid of all the Open With associations for Windows applications. The problem is, the Windows Registries in my Windows VMs are full of literally hundreds of the useless "Open With" entries created by Parallels without asking me or informing me. Is there any quick way to get rid of all this crap or do you really have to go through the Registry manually and delete all the keys with the Open With entries referring to Mac applications? This wanton vandalism of my operating systems is really, really, really, really annoying! In fact, this whole feature is a total disaster -- nobody wants or needs file associations for everything between the VM and the host computer. At most you want associations for just a couple of things, and you want to set it up manually yourself.