I am having difficulty with the bottom soldermask gerber file in a 2 layer PCB in which all components are located on the top layer. There are no holes or any other features on the bottom side, so essentially the bottom soldermask gerber file should be blank. The bottom soldermask gerber file is generated by OrCAD, but when I try to open it in a gerberviewer, the file type is not recognized. Further, the PCB manufacture we sent the board to is having trouble with it as well. They had to ask us if there was soldermask on the bottom layer or if it was unmasked altogether. I'm curious if there is a work around for this situation and any help is greatly appreciated.
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