There is only one file type that uses the .ODIF extension:
Open Document Interchange Format
Encoded binary document that uses the ODIF (Open Document Interchange Format) file format, which is part of the Open Document Architecture (ODA) standard; stores the binary data stream representation of an ODA document; used as a transport format suitable for transmission between systems.
ODA is an object-oriented document architecture that was developed in the 1980s and 1990s, but it was not well-accepted. It is rarely used.
Updated: August 8, 2010