I'm getting ready to do a bootcamp install and bought/downloaded Win7 Home Premium from the MS website. When it finally downloaded, the file extension says .iso.part As we speak, I'm burning the image to a DVD, so I don't know if it works properly, but what does the .part mean? Did it download correctly? When I was downloading, there was a zero k file with a .iso extension and a separate file with a .part extension that incremented in size as the download progressed. Can someone explain this?