Hi @Leng T,
In a Windows file explorer window, you can type %AllUsersProfile% into the address bar and it will take you to your PC's program data directory. The default path for this directory is:
C:\ProgramData
So the full path referenced in that line of the flexsim web server configuration file is:
C:\ProgramData\FlexSim\FlexSim<version>
The FlexSim Data Directory is used by the webserver to store information about Jobs which have been submitted to the webserver.