Unfortunately, it appears that Parallels Desktop for Mac build 4124 continues to drop a bunch of items in the /System/Library/Extensions folder with ambiguous, cryptic file names. For example, "ConnectUSB.kext" looks like it has something to do with USB, but who created this file? There are also file called "hypervisor.kext" and "vmmain.kext" installed in the Extensions folder. Parallels is acting like they own the entire the entire Extensions folder. Now that Parallels is going to have competition from VMware, don't you think that VMware might also have something to do with a "hypervisor"? The Mac's /System/Library Extensions folder is a critical area and third parties should not just be dumping random files in there. If third party developers do install items in the Extensions folder, then the files should be named in a way that makes it easy to see who made it and what purpose it serves. While poor file naming may be typical of Windows software, Mac users expect better.