I have no problem opening Visio 3.0 drawings.
Visio had settings for page scale - like 20 feet (of drawing) equals per inch (of paper)
An opened drawing is legal landscape and the object sizes and positions are in inches corresponding to the paper size.
For example an object that is 8’ wide and 9’ high is .40" by .45" - a scaling factor of 240 or 1" on paper equals 20’ on drawing.
Also would like to select units of measure - feet, inches, feet and inches, etc.