I am a Mac User. My friend sent me two video because the file size is too big. My friend added an extension .001 and .002 at the end of each (WMV)video for identification. After I downloaded these two video, I removed the .001 and the video plays fine on the QuickTime and the RealPlayer. However, it does not work for the second video on either software. Does anyone know what should I do to be able to watch the second video? Is there anyway I can merge two video together? What kind of software will make it work? Thanks for any suggestions.