I run Windows XP on a PC. So I am surprised to find a folder on my C drive called .Spotlight-v100. I see by googling this name that it is a feature of the Mac operating system and has something to do with file indexing. But I don't understand why it has appeared on my computer. I have iTunes and QuickTime installed, and Safari, but this is not a Mac OS. Can anyone tell me what program I might have installed that would have caused this folder to be created? I also have installed Copernic Desktop Search which indexes files, as I understand it. Thanks.