Gerber import information
Units Imperial
digit format 2.5
Integer 2
decimal 5
mode - absolute
zero suppression Leading

DS9121BQRev1.GTP	 - Top paste mask
DS9121BQRev1.GPT	 - Top pad mask

DS9121BQRev1.GTO	 - Top silk screen
DS9121BQRev1.GTS	 - Top Soldermask
DS9121BQRev1.GTL	 - Top Metal

DS9121BQRev1.GBL	 - Bottom metal
DS9121BQRev1.GBS	 - Bottom soldermask

DS9121BQRev1.GKO	 - Mechanical / Board outline
DS9121BQRev1.GM31	 - Mechanical / Informational layer
DS9121BQRev1.GM11	 - Top Assembly layer

Drill import information 
Units Imperial
digit format 2.5
Integer 2
decimal 5
mode - absolute
zero suppression none

DS9121BQRev1.TXT	- Ascii drill file
DS9121BQRev1.DRL	- Gerber drill file

DS9121BQRev1.GG1	- Drill Position/Guide file
DS9121BQRev1.GD1	- Drill Symbol/Drawing file