mods need help

could anyone help me?
i need help on making mods
i download everything i got Adobe Photoshop Lightroom 2.6
and GIMP 2
but every time i am trying to make a mod it says mods\PV_L96A1.dtx' failed: Unknown file type says in all
so plz dont send me a link to Rez editing for non-Photo shoppers
or anything els cues i tried them all never work
i need someone to team view me plz
someone help i wana make mods