Hello Nuser and Travolter,
Thanks for your questions.
Nuser, it is supposed to edit wmv/asf files with wvc1 video with GOP accuracy, unfortunately the smart editing of such files is not available at the present time. Do you have some problems with editing of those files, if yes, could you please describe it more detailed?
Travolter, please check if you have AAC codec installed and used on your PC.
You can check it using e.g. K-Lite Codec Pack (Start -> All programs -> K-Lite Codec Pack -> Configuration -> ffdshow audio decoder) - see the screenshot below: