If the circles in your design match the size listed below then the file will cut the correct size hole for that rhinestone size. Changing the size of a file will also changes the size of the circles and they will no longer be the correct size to use with the intended stone size the design was made to use with. You can only change the size of a design so that the circles match one of the stone sizes listed below.
ss6 (2mm) - .098 inches or 2.5mm
ss10 (3mm) - .13 inches or 3.3mm
ss16 (4mm) - .173 inches or 4.4mm