oook having practicly become the master of dds files (im reskinning the devil right now ^_^) theyve made it nice and simle this time round as dds is the new universal skin files for practicly every game , you need to have the dds plugin for photoshop which is found here
may i also recommend the .dds thumbnail *while browsing files in windows* viewer found here
if youve already done these steps which i doubt youve got this specific plugin because its practicly impossible to mess up the save even though it looks slightly difficult you dont have to change a thing! good luck and if ive solved nothing well...leave the skinning to others :upside