.FBC File Extension
Family Tree Maker for DOS Backup File
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What is an FBC file?
Compressed backup of a family tree (.FTM) file created with Family Tree Maker for DOS; created as a backup in case the original family tree file is lost or damaged; can be restored by selecting "File→Restore From Backup" within Family Tree Maker.
NOTE: Family Tree Maker for DOS uses the ".fbc" file extension, while Family Tree Maker for Windows saves backups as .FBK files. Family Tree Maker version 16 or earlier can open FBC files.