Shorten (SHN) is a Lossless Audio Compression format. It is mainly used to encode Live Performances. The
format itself is outdated and has the worst compression ratio of any of the recent Lossless formats. It's only high-point
is that it works on very very weak systems (Sub 200mhz).
The only DirectShow decoder for this format is "DirectShow .SHN Filter". It does NOT support seeking as far as I know.