RTF

File Format
Name	RTF
Ontology	Electronic File Formats Document RTF
Extension(s)	.rtf
MIME Type(s)	text/rtf, application/rtf
Released	1987

RTF (Rich Text Format) is a format created by Microsoft and intended to be more broadly portable than their application/version/platform-specific file formats such as DOC and DOCX, but still proprietary to Microsoft (though other vendors' software can also read and write it).

Specs

• RTF 1.0 spec
• RTF 1.5 spec
• RTF 1.6 spec
• RTF 1.8 spec
• RTF 1.9.1 spec
• Some other spec versions in various formats including RTF itself

Other Links

• Wikipedia article