How do you edit halflife .wad files?

[JMaster]

What kind of program do you need to edit .wad files for halflife?

Edit: I'm actually trying to change that startup screen in counterstrike, and I know it can be done because it got changed when I installed a new soundpack. I tried to use wally to open the .wad file, but it was just blank.

 

[konichiwa]

Wally. Don't have the link, but do a search for it.

 

[DannyLove]

http://wadfather.game-edit.com/
link enjoy

 

[Pastore]

just use notepad... its just as easy...

 

[JMaster]

beast you can't edit image files with notepad