CWR file store the results and the other are temporary files IIRC, try to contact your VAR: with the assembly alone they can try to recover the lost content.
Another option is to enable "load all studies" in simulation options and hope the program recovers all the tabs.
I had a lot of data loss in simulation and I quit using the configurations completely as it seem to cause a lot of issues unfortunately.
Also switching from one configuration to another seems to confuse SW on the update status of the scenario making exclamation marks pop up here and there.
not certain to work in this case, but worth trying (as usual, when dealing with Simulation Problems), because it helped in cases of similar Problems:
-erase all tmp data (C:\Users\username\AppData\Local\Temp)
-erase all files dealing with study 2 ( .BD2, .BDF, .CWR, .LOG a.s.o.)
BTW: because of These Problems, I make a backup, usually on daily basis