FOLDER_STARTUP
InstallShield 2020 ยป InstallScript Language Reference
The FOLDER_STARTUP system variable stores the fully qualified path to the Startup folder, which contains the program folders and items that are launched when Windows starts.
To ensure that groups and folders are created at the proper location, the location to which FOLDER_STARTUP points changes when the default group or folder type is changed from Common to Personal or from Personal to Common when the system variable ALLUSERS is changed.