How to extract gma files?

Tried to extract .gma files to review the code, but it doesn’t work (I tried GMad extractor by garry). It just flashes a cmd.exe box and then closes

Were you using it properly? Did you read the instructions?

yes

So how did you run it?

I did a shortcut and I changed the path to where one of my .gmas were

Just run it on CMD and look at the output.

Thanks it works