Unzip them to your ais folder in the Stronghold directory (I think).

firstly you need to unzip the files to any directory then copy all the files to the different folders in the stronghold file. eg: frederick1.aiv to the aiv folder do that with all the aiv files and the same with the bink files copy them across to the binks file, however when you come to the sound files copy them to the speech file located in the fx folder. if that doesnt work then email me at aaaghbug@hotmail.com hope this helps!

Done, but what is the different b4 and after?

what do you mea nby difference b4 or after the difference is that you get new characters (phillip, fredrick, sherrif)