Noobie question about coreldraw graphics suite 12

Hi

I just bought a laser cutter which came with corel draw graphics suite 12 and corel laser . I imported a dxf file into it to cut. out but for

some reason it seems to be dealing in inches when the dxf was mm . For example when it is meant to cut a hole that is 10mm square

it actually thinks its a hole that is 254mm square in other words  its saying 10mm is 10 inches . What am I doing wrong or how can I fix it .

I thought at first it was a damaged file but its happened on several that I downloaded

Regards

Don