SwfDotNet framework is a Scripts software developed by swfdotnet. After our trial and test, the software is proved to be official, secure and free. Here is the official description for SwfDotNet framework:

BS Editor: The SwfDotNet framework is a full .Net open source Library for writing, reading and generating Flash(tm) Swf files on-the-fly with C# .Net or VB.Net. It's composed of packages for IO writing/reading process. Written by Olivier Carpentier.