Afternoon, Anybody ever heard of DIAD CAD software? i have a few files I wish to convert to .DXF but am unable to open the files, file extensions of DIAD is .DR, Any help would be appreciated.ThanksDaff

Never heard of it.  What era was this? 

I believe it was 1980's

Try a local reprographics firm.  They have to deal with many different file types.  Maybe they have a conversion program will work.