If you double click on the either the L-1011 Cleared for takeoff (KSEA).FSSAVE, or L-1011 Cold-n-Dark (KSEA).FSSAVE file (the file extention might not be visible, but they should be using the FSX icon  to identify their  association with FSX), they should start FSX, and load the L-1011 in that condition (Ready for Takeoff, or Cold n Dark) into it.

It's strange that they are only in the FSX\Captain_Sim\1011\flights folder, because they should also be placed in the Documents\Flight Simulator X files folder during the installation. I suggest you copy them to the Documents\Flight Simulator X files folder, so you can load them in FSX (also copy the cs1011base.PLN file there as well, and never change, or delete it as it's needed for the Captain Sim INS to function correctly).