Choose Export from the File menu. The Export window opens. How do I export a file in GEDCOM format in Family Tree Maker?ġ. GEDCOM stands for GEnealogical Data COMmunications it allows genealogy files to be opened in any genealogy software program on a Mac or PC. This format allows different family tree software applications to understand and open the same family tree file, bypassing the differences in coding that would normally prevent sharing. If your great-aunt doesn't use the same software you do, for example, you’ll need to share your family history with her in GEDCOM format. Export and Import of GEDCOM Files in Family Tree Maker