BOT.pho	 - Bottom Layer Copper
FAB.pho  - Drawing
L2.pho   - Inner Copper Layer No.2 as Positive
L3.pho   - Inner Copper Layer No.3 as Positive
MB.pho   - Solder Mask Bottom Layer
MT.pho   - Solder Mask Top Layer
NC.drl   - NC Drill
SB.pho   - Silkscreen Bottom Layer
ST.pho   - sIlkscreen Top Layer
TOP.pho  - Top Layer Copper