Save for version 5.0 with Labview 7.0

[Mark999]

Hello!
I recently upgraded from LabView version 5.0 to 7.0. Now  I need to
work on some LabView 5.0 VIs while keeping their original version.
LabView 7 only supports saving to the previous version, which means
6.x.
What can I do? Is it possible to install both versions of LabView (5.0
& 7.0) on the same system or does that mean trouble?
Thanx.