Top Silk                - *.slt
Top Mask                - *.smt

Top Layer               - *.top
Internal Layer #1       - *.in1
Internal Layer #2       - *.in2
Internal Layer #3       - *.in3
Internal Layer #4       - *.in4
Internal Layer #5       - *.in5
Internal Layer #6       - *.in6
Bottom                  - *.bot

Bottom Mask             - *.smb
Bottom Silk             - *.slb

Outline                 - *.brd

Plated Holes            - *.drp
Non-plated Holes        - *.drn

Paste Top               - *.pst
Paste Bottom            - *.psb

Plated Milling Contours - *.mil