Platform: Windows (Tested on XP)

Ever heard of IEXPRESS.EXE? Neither had I, so I ran it. It's a simple app that develops self-extracting packages that are like Microsoft patches. The app can be used to created Cabs, extract files, or extract and run a .EXE after extraction. In a small network, it could be a very easy and cheap way to distribute something. This app was just automatically on my system, using XP Pro SP2.