由Protel2004產生的Gerber文件各層擴展名與PCB原來各層對應關係表:
Layer : File extension
-------------------------
頂層Top (copper) Layer : .GTL
底層Bottom (copper) Layer : .GBL
中間信號層Mid Layer 1, 2, ... , 30 : .G1, .G2, ... , .G30
內電層Internal Plane Layer 1, 2, ... , 16 : .GP1, .GP2, ... , .GP16
頂絲印層Top Overlay : .GTO
底絲印層Bottom Overlay : .GBO
頂掩膜層Top Paste Mask : .GTP
底掩膜層Bottom Paste Mask : .GBP
Top Solder Mask : .GTS
Bottom Solder Mask : .GBS
Keep-Out Layer : .GKO
Mechanical Layer 1, 2, ... , 16 : .GM1, .GM2, ... , .GM16
Top Pad Master : .GPT
Bottom Pad Master : .GPB
Drill Drawing, Top Layer - Bottom Layer (Through Hole) : .GD1
Drill Drawing, other Drill (Layer) Pairs : .GD2, .GD3, ...
Drill Guide, Top Layer - Bottom Layer (Through Hole) : .GG1
Drill Guide, other Drill (Layer) Pairs : .GG2, .GG3, ...
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