The file extension OFX denotes the Open Financial Exchange Format (open exchange format for financial data). This format is SGML-based and was created in 1997 by Intuit, Microsoft and CheckFree. The files may include transactions such as bank transfers, account balances and other financial related data.
This open standard allows the easy exchange of data between programs of different manufacturers and systems, such as banks and home users.
The OFX standard is increasingly replacing the Open Financial Connectivity format of Microsoft Money.