There has been several discussions in this forum about flight plan format. Our latest installers are also installing a copy of the official Garmin schemas to help you out in these cases ("C:\ProgramData\Reality XP\Common\GnsTrainer").
You might have noticed each flight plan is an xml file, with a header specifying the schemas it follows (this is standard XML stuff). The URL is most likely outdated now because Garmin has changed their location, but a quick google search finds them o
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