Install winrar
http://www.rarlab.com/ it can unpack Everything, then download XSP Quick Unpacker
http://xmoonproductions.org/viewtopic.php?f=27&t=3483 you need to unpack dungon first with XSP Quick Unpacker v1.2 then make a copy off pack_dungeon to temp and then you simple put the mod in to pack_dungeon and rename it to what ever you like and as long as you have the original left in temp you can copy that to X Moon Productions\XStoryPlayer 3\pack and make 1 more mod you can select in Fast sex or story.