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I read that entire post in a baby's voice on account of your baby avatar there. Sorry about that.
It's a HL2 mod, so you can play it if you have any HL2 game, but it has modles, textures ETC from episode 2, so if you don't have episode 2 there'll be missing modles and textures around.
You don't need Episode 2 to play it, but without it there'll be alot of missing models and textures xD
It works with Paint.net and the Paint.net VTF thing from nem's tools. both are free.
Oh well. I guess the longer it takes the better it will be.
I'm having trouble with getting photoshop. is there a way to do it without any new software? otherwise POOP TO THAT I SAY!
Try making one with the files in it.
What program do you need to do this?