I want to edit some .avi videos (cut them, to be precise) in VirtualDub but it failed to open the files. They are encoded in xvid, which I have installed, and play in KMPlayer without problem. Also, all other xvid videos can be opened and cut just fine by VirtualDub. I suspect there's something wrong in the first few bytes of these particular videos (the magic number?). This means I have to open the offending files in a hex editor and make some necessary adjustments to the header. Problem is, they are very large ( 3 GB each) and take very long time to open in UltraEdit. Can UltraEdit open just the first few bytes of a file? If not, do you know of an application that can do that? Edit: I'm using Windows XP.