AvisynthEditor
AvisynthEditor helps you edit AviSynth scripts and it allows you to use options such as syntax highlighting and auto-complete code.
693KB
22,324
Windows Movie Maker doesn't support FLV files, which is why you're having trouble viewing them.
You can either convert your FLV files to a format that Movie Maker supports, such as MP4, or try using a different video editor that handles FLV, like VSDC Free Video Editor or Avidemux. Both are listed on CODECS.COM.