Importing Old Corel files -- Need version 7 I guess

Have a couple dozen old corel files.   I installed version 3 on an xp virtual machine and they won't open in that.  I installed version 9 and they won't open in that.  I guess most of them them were created with version 4 or 5 (been using corel for a long time but can't find those disks).  Hopefully they're not corrupt. Perhaps, I need version 7.  Any thoughts on that?  Anyone have a version 7?  Any other way to retrieve these files? 

I'm looking to retire my old Win 7 machine so I'd like to recover them before I go fully win 10 (which apparently won't load old corel versions).  Thanks for any help