what is .fsp files and what is .fst files?

i have found something strange in the users manual. it is some explanations about .fsp files as following picture:

but i found every scenario states of my experiments were storied in .fst files

and i found the explanation about .fst files is a Flexsim Chart template (.fst).
i donnot know what is the real meaning of .fst files and what is .fsp files.
thanks in advance!

Oliver,

.fsp Files were used in version 5.1.2 and earlier, and are no longer used in FlexSim. They are FlexSim Project files and it saves the entire tree under MAIN:/ .fst files are FlexSim State files, and they can be used to save FlexSim in a certain state. By using .fst files you will be able to run your model for a certain amount of time, save the state, and then load the state later, and all of the itemtypes will be in the same place in the model.

I hope this helps.