@ivelin.peychev What is not correct? I went into Windows settings, changed the association for .rws from Rhino 5 to Rhino 6 and .rws file openned in Rhino 6.
I also created and saved a worksession .rws file in WIP V7. Openned it by double clicking and it opened sucessfully in V6.
It is possible that installation/update of WIP Rhino 7 could be changing the association for .rws files. However I have WIP Rhino 7 installed and update the installation every week and .rws files are not associated with WIP Rhino 7. So that indicates that installation/update of WIP Rhino 7 is not changing association on my computer.
Perhaps something else is changing the association in your system.