I've just downloaded Vercengetorix's CAS Extractor. I saved it into the folder 3DS Max/scripts. So, in Max, I went to utilities, then run script. I selected the CAS one from the scripts folder. A new option appeared in the utilities dropdown menu, RTW Import/Export. Anyway, I selected it, but when I try to load the RTW unit models, it tells me they are not in a readable format or something along those lines.

Any ideas what I'm doing wrong, any help would really be appreciated.