Editing Texture DLL files in gimp

I downloaded the Beretta m9 file from BF3, I like the textures, I just want to make it look cleaner (Removing the dirt, scratches ect.) The texture file is a dll, How can I edit that in gimp? im using 3d max 2013 btw

bump?! please answer this is VERY important!

i ported the m9 to source
this is how it looked like after i edited the dll files in paint

http://puu.sh/1A0sx

How can I edit the ddl files? I NEED to know!

drag and drop the dll files into paint

MY MISTAKE the texture file is dds

[editline]12th December 2012[/editline]

And I tried dragging the files, paint says that its not supported!