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So I was having a problem with GSC not opening so I decide to search around my computer files looking for the problem and I found the problem.
Steps:
1. Uninstall GSC Studio
2. Navigate to the folder C: \Users\YOURUSERNAME\AppData\Local
3. Delete the folder in local named iMCS_Productions
4. Install Black ops 2 GSC Studio again
5. Should work now just open it!