AutoCad R14 not opening files as blank

I have produced some 2D drawings that need to be sent for CNC routing.

When the fabricator (who uses AutoCad R14) opens the files he states they are coming up blank.

I have tried a couple of different options when saving, but no luck and I haven't got AutoCad to test.

Does anyone have any ideas on how to assist please.

Many thanks,

Steve