[Portuga]

Thanks in advance for any help. My problem is, I'm trying to change the lenght of the shotty, seems when I extract the winchester files from Pak2 it has 2 files there, a winchester.tga and winchester.dds, what do I have to edited?? seems editting the tga file alone does not do it, do I also have to edited the dds file?? if so how do I go about doing that, I use Photoshop or Paintshop Pro, any help would be appreciated. Thanks.