What is the MBF file format?
An .mbf file is a backup archive created by Microsoft Money, the personal finance application Microsoft sold from 1991 until its discontinuation in June 2009. Each .mbf backup contains a complete snapshot of a Money database - accounts, transactions, budgets, investment portfolios, and payee records.
Internally, .mbf files are Microsoft Cabinet (CAB) archives, identified by the MSCF signature at the start of the file. The CAB archive wraps a single .mny MSISAM (Jet/ISAM) database file. Cabinet compression (LZX or MSZIP) keeps the backup compact; the format also includes per-file checksums as part of the Cabinet specification.
To restore a backup, the .mbf file must be opened via File > Restore Backup within Microsoft Money - renaming it to .mny will not work because the CAB wrapper must be removed by the application itself.
Microsoft released Money Plus Sunset Deluxe as a free download after discontinuing Money; it can open both .mny and .mbf files on Windows 10 and Windows 11, though it lacks online banking, automatic updates, and support. Quicken and GnuCash are the most widely used replacements today.
Security & safety
RISK: LOWContains sensitive personal financial data (bank accounts, transactions, investments). No executable content. High privacy risk if file is shared or found on discarded hardware.
Format details
in a nutshell- Mailbox Folder (various email clients) - Some email clients use .mbf for mailbox folder index or folder files - unrelated to Microsoft Money.
Programs that open MBF files
Windows2 apps
Microsoft Money
Paid File > Restore Backup - selects the .mbf and restores to .mny. Discontinued; use Sunset Deluxe instead. 
Microsoft Money Plus Sunset Deluxe
Free Install Sunset Deluxe, then File > Restore Backup and browse to the .mbf file. Technical details
deep spec| Developer | Microsoft Corporation |
| Application | Microsoft Money (versions 3.0 through Money 2008) |
| Container | Microsoft Cabinet (CAB/MSCF) |
| Magic bytes | 4D 53 43 46 ("MSCF") at offset 0 |
| Byte order | Little-endian |
| Encoding | Binary |
| Compression | LZX or MSZIP (Cabinet compression) |
| Payload | Single .mny MSISAM (Jet/ISAM) database file |
| Checksum | Per-file checksums included in the Cabinet format |
| Typical size | 1 MB - 9 MB |
| Stored data | Accounts, transactions, budgets, investment portfolios, payees |
| Associated OS | Windows |
| Restore method | File > Restore Backup in Microsoft Money (cannot rename directly to .mny) |
| Status | Discontinued June 2009; Money Plus Sunset Deluxe (free) opens .mbf on Windows 10/11 |
| Released | ~1994 (Microsoft Money 3.0 era) |
| Latest version | Microsoft Money 2008 (last commercial version) |
MBF conversions
Community Q&A
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