I hope this is the right place to ask these questions. It is not really a project but I did not see where else it might fit. I have a set of GBR files that was created 15 years ago by some pcb product of the time. The designer did not make a top solder mask file. The top layer of the 2 layer board was split into 2 separate GBR files. As you might guess, the board houses will not even talk to me about merging the 2 files to make up that top layer. One file is the ground.gbr because the top is “mostly” ground plane but does have a a couple runs not tied to ground. Anyway there is a separate GBR file for the non ground portion. Since I do not have a schematic file and no project file. Is it possible to merge those 2 files to make the top layer? How can that be done?
Second, is there any way to also create a top solder mask file without having that file already?
Thank you for your help.