Normally I export a flight plan directly to the LocalState folder of the MSFS using the export function (file size 2 KB)
Another option is to export the same flight plan from Simbrief as a pln file (file size 11 KB).
This would not bother me if other programs such as FStarter24 often (but not always) display errors with the flight plan saved by Navigraph, while the flight plan from Simbrief is displayed correctly.
What’s the difference between these saves with blatantly different memory sizes?