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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .AFT | Ancestry.com Inc. | Data Files | Family Tree Database | Software MacKiev Family Tree Maker | Ancestry.com Inc. |
| .FBC | Ancestry.com Inc. | Backup Files | Family Tree Maker For DOS Backup File | Software MacKiev Family Tree Maker | Ancestry.com Inc. |
| .FBK | Microsoft Corporation | Backup Files | Microsoft Dynamics NAV Backup File | Software MacKiev Family Tree Maker | Ancestry.com Inc. |
| .FTB | Ancestry.com Inc. | Data Files | Family Tree Maker Genealogy Data | Software MacKiev Family Tree Maker | Ancestry.com Inc. |
| .FTM | Interscape | Audio Files | FamiTracker Module | Software MacKiev Family Tree Maker | Ancestry.com Inc. |
| .FTMB | Ancestry.com Inc. | Backup Files | Family Tree Maker Backup File | Software MacKiev Family Tree Maker | Ancestry.com Inc. |
| .FTW | Ancestry.com Inc. | Data Files | Family Tree Maker File | Software MacKiev Family Tree Maker | Ancestry.com Inc. |
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