Please help with DMX.

Hey guys I need a little help. I don’t have maya and every time when I try to install any of autodesk software, it’s just doesn’t work.
I need to cut some frames from two dmx files.

http://dl.dropbox.com/u/20458145/standup_backward.dmx - cut the first 43 frames.
http://dl.dropbox.com/u/20458145/standup_forward.dmx - cut the first 52 frames.

And please keep them after in dmx too (I mean new files without cut frames).

Thank you!!!