For anyone needing to convert a RM9 database file to work with an earlier version (RM8 or RM7), there is a way that does not rely on GEDCOM and its attendant losses which are greater than by this direct approach:
https://sqlitetoolsforrootsmagic.com/database-revert-rm9-to-rm8-to-rm7/
Not saying it’s foolproof but might well serve some useful purpose.
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