我的Drill Data文件打不住开。请高手指教

出gerber的时候产生Drill Data用CAM350打不开。（导入到cam里一篇什么都看不到）

用文本打开内容如下

M48
INCH
;LEADER: 12
;HEADER:
;CODE  : ASCII
;FILE  : syn-chiptestv01_122702-1-8.drl for board syn-chiptestv01_122702.brd ... layers TOP and BOTTOM
;   Holesize 1. = 12.000000 Tolerance = +0.000000/-0.000000 PLATED MILS
;   Holesize 2. = 28.000000 Tolerance = +0.000000/-0.000000 PLATED MILS
;   Holesize 3. = 32.000000 Tolerance = +0.000000/-0.000000 PLATED MILS
;   Holesize 4. = 35.000000 Tolerance = +0.000000/-0.000000 PLATED MILS
;   Holesize 5. = 40.000000 Tolerance = +0.000000/-0.000000 PLATED MILS
;   Holesize 6. = 48.000000 Tolerance = +0.000000/-0.000000 PLATED MILS
;   Holesize 7. = 68.000000 Tolerance = +0.000000/-0.000000 PLATED MILS
;   Holesize 8. = 100.000000 Tolerance = +0.000000/-0.000000 PLATED MILS
;   Holesize 9. = 120.000000 Tolerance = +0.000000/-0.000000 PLATED MILS
;   Holesize 10. = 100.000000 Tolerance = +0.000000/-0.000000 NON_PLATED MILS
%
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M30