What do you use to open a FLV file to edit it?

i cant edit it with movie maker it says something like cant open a flv thing.

Moyea FLV Editor Lite Beta is a free FLV editor especially designed for FLV files. With this editor, you can edit YouTube, MySpace, blogTV, etc. The editor does not recode the FLV files, so it perfectly keeps the original quality. The notable thing is it enables you to edit FLV with timeline to trim FLV video length, split FLV duration, rip FLV audio and video, replace the FLV audio, add cue point and metadata, etc. Just implement your cool ideas on FLV now!