Gsc extension stands for Call Of Duty game map file. You can try to open gsc extensions with Call of Duty Map fX/gsc Editor.

These are the map files which used with Call Of Duty game. If you want, you can create special Call of Duty Mod versions. In this case, you can change gsc files or create your own map.
You can easily find different kind of Map editor softwares via internet. We can recommend you Call of duty map fx/gsc editor. 

What to use gsc

Call Of Duty Map FX/GSC Editor

which page related to gsc file

gsc Related Searches

You can check related links about gsc fileextension.