Gerber Top Layer Data File
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What is a GTL file?
Gerber format files, like GTL, function similar to .PDF files where they specify how a PCB should appear but are not meant to be edited.
The name of the GTL file is derived from the name of your PCB. Therefore, if your PCB is called "MyProject," the file will be called MyProject.gtl.
NOTE: The GTL format was originally developed by Gerber Systems but is now maintained by Ucamco.