Clipping an M4V file

[tsiankiio.livejournal.com]

Okay, so I used handbreak to rip my DVDs, and I now have a .m4v file. My problem is that neither VirtualDub or VirtualDubMod will open it, and MPEG Streamclip crashes when I try to open it. Is there something else I should be using to turn my one big .m4v into smaller clips? Or am I just doing something stupid?

I have the amvapp package, and am running Windows 98. Usually I use WMM, but I decided that no longer suited my needs, so this is the first time I've tried clipping anything.