I made a litle program to check if exists duplicates names. Thanks to Lo2k who give me the idea!
1. Create debug list from .gp4 File, Choose "Obejct Names", Click "create Debug File"
2. Drop file to my program and Click "Check doubles"
Thats all.
I upload only the exe file, Iam not sure if is more files needed.
Frameworks 4.3 needed.
I hope it is usefull.
Program