The title pretty much says it all.

Edit (11/30/2012): I've found a plugin for GMax which if you have some intermediate skills with programming, you should be able to decipher how to load these file formats looking at this source: http://ghastley.org/DS/importers.asp

(Direct) http://ghastley.org/DS/download/SiegeMaxUpdate_1_5.zip

its PRS for animations and ASP for meshes

Thanks for the reply but that's not actually what I meant.

I already knew the format names, but I'm asking for the technical format.

I've edited the original post with information on something that has the file formats inside.