.
Have you checked the NC File Path setting??
If not go to your CAM Tree and follow this.
Open CAM Part > Right click "Milling Tools" > Left click "Current Settings" > Left click "Machine" and then look at the "window" under "NC File Path".
If your Computer Hard Drive has the letter "C" assigned then it should show C:Program FilesBobCAD-CAMBobCAD-CAM V23NCMill
If your drive letter is "C" and the above is not correct then use the "Select" button to set the correct path.
The same applies if you have a different letter assigned to your hard drive as BobCAD usually defaults to "C" drive.
Hope that was clear and of some help to you.
Regards
Rob