How to extract files from a gcf?

I need to extract the materials folder from a gcf to sort out a texture problem. All I need is a short answer.

GCFScape.

And you only need to extract textures from a GCF to fix stuff if you’re a pirate.

Nope, im not actually. Heres the reason I need it-
http://www.facepunch.com/showthread.php?t=1000942

And heres my steam profile-

So you dont need to assume im a pirate.

what? my GMod goof’s sometimes so i just re-extract the GCF.