Editing MQV files?

[Icowa]

Can anyone recommend a software (freeware?) with which I can edit my MQV files?
I am looking for something that allows me to cut parts out, to turn the movie 90° left/right, etc.

Or any other ideas are welcome (conversion to another format allowing me to edit the video).
Thanks

[exNewt]

Download QuickTime (it's an IEEE standard, after all), change the file extension to ".MOV" and do 'cut & paste' editing. Free.