This is something I can program to detect and ignore but as of SU3 MSFS 2024 is pumping 165 SIMCONNECT_RECV_EVENT_FILENAME/FlightPlanActivated events into the simconnect API during the start sequence.
MSFS2024_SU3_FlightPlanActivated_on_startup.log (13.8 KB)
FWIW MSFS 2024 still doesn’t fire the FlightPlanActivated event when the user loads a real flightplan, only just these new spoof events, but 2020 does so it’s worth keeping in the app. My simconnect app feeds a flight planning web app which renders these flightplans on a map so that’s being stressed by this unexpected blitz, but these new event transmits are a common pattern so it’s possible to code around it.
Minor detail: are .flt files supposed to trigger FlightPlanActivated? I would have expected “FlightLoaded” but these look like mission file loads so don’t really know.