I had an email late last evening from someone wanting to prototype a miniature thing.
He sent a .STEP (3D) file : I don't do 3D so I could not open it.
I asked him to resend as a .dxf or .pdf which I could look at easily.
A new file arrived at about 1 in the morning - named PDFdesign.rar!
I don't have a rar viewer (isn't it only pawn brokers that need one of those?) so can't open it again.
Not sure if the bloke is being deliberately obtuse - and if the item really does need to be true 3D I probably can't make it anyway.
I'm inclined to ignore him, but wondered how others would handle this.