Well, I found out the hard way.
I have operated DraftSight V1R5 (or R4 ?) on my Dell laptop under Windows XP for a couple of years perfectly OK.
Then, the backlight on my laptop died, so I added an external HP Compac LE1711 LCD monitor.
DraftSight display of drawing is now non-existent and funny colored squiggles appear as the cursor moves jerkily across screen
Acquired and installed the latest monitor driver from HP.
Every other application on the machine operates fine, DraftSight is the only problem.
So, I thought I would do a re-install, bad mistake.
I did not keep a copy of the original installation file (yes, kick me).
The only apparent offering currently available is just labelled as not suitable for Windows XP and I cannot find any sign of an archive for older versions.
Any suggestions ?
I am just a small hobby user, if this is Dassault Systemes attitude then perhaps it is time to look elsewhere.
John