eagle.epf				: file made by EAGLE
motherboard.brd 			: original file of the motherboard made by EAGLE
motherboard.drl 			: drill rack file made by EAGLE
motherboard.cmp 			: Copper Component side 
motherboard.ly2				: file made from the CAM processor gerber_rs274x for the inner top layer
motherboard.ly14			: file made from the CAM processor gerber_rs274x for the inner bottom layer
motherboard.plc				: Silk Screen Component side 
motherboard.sol				: Copper Solder Side 
motherboard.stc				: Solder Stop Mask Top 
motherboard.sts				: Solder Stop Mask Bottom

 