Hi there,
I know a lot about computers, technology, and various file types, but interestingly I have never actually come across the GBR file type.
Never the less, I have software that was able to convert your DWG file to GBR format. I don't have any software that will open the GBR file, so I have no idea if the GBR file is any good.
I was hoping to just send it to you via chat, but it seems I had to make a bid before being allowed to communicate with you.
I'm happy to send it to you for you to review before accepting my bid. I can't make any changes to it, so I want you to be sure it is what you need.
Regards
Rod