I usually use Cam350 tool to check and modify the gerber file. It needn't limit in OrCAD gerber tool.As long as the gerber file generated in Gerber600 or Rs274x etc. general format, general tool could read in.
i got a problem in gerbtool 13
after importing the file i found nothing wrong in the job.i exported the gerber to gerber format. now when i imported i found some extra circles present the in it. what is the reason behind this