Well basicly, ProfQ was the one who came up with the idea to import a dll into an unreal package. Unreal packages can hold unrealscript code, textures, meshes and sounds. It's rather easy to import any binary format into an unreal package as a sound. Both QValidate and UTDC use this method. Sounds can be exported from unreal packages from the command line.
You answer fast. I posted and saw this was in downloads so sorry if it is in the wrong place. And thanks for this answer. It sounds like the unreal package can act as a container. It will be of interest to find the complete file format.
DLL
Linear Mode
