In CAM, file's square slot is shown as round shape.
Can anyone explain why?
Also I have enabled the G85 command.
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If you have defined the square hole as drilled hole, it will be round. There is no such thing as square drills. In addition, the drill file only knows coordinates and radius.
In order to make square holes you have to create a square on a mechanical layer, often the same layer as the board outline milling layer.
You will also have to notify the manufacturer that you have cutouts. If the manufacturer has an automated system, you will have to mark the cutouts yourself. (eg: Eurocircuits)