I don't think that it is really important to pack your .tga's back into the .dat files. The only reason you would want to do that is if you are skinning the type XXI. Just simply put the .tga file into slilenthunterIII\data\textures\tnormal\tex and the skin will show up and work fine.
Edit: Hehe, read the next post and you'll think "deja vu"