Transport Neutral Encapsulation Format
From Just Solve the File Format Problem
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It is usually implemented as an attachment called '''winmail.dat''' or '''win.dat''', which Microsoft programs know what to do with, but is a useless and confusing attachment to everybody else (unless they use one of several programs and plugins that have been devised to help non-MS-ers cope with it). When saved elsewhere as archives or samples, sometimes the .tnef file extension is used. | It is usually implemented as an attachment called '''winmail.dat''' or '''win.dat''', which Microsoft programs know what to do with, but is a useless and confusing attachment to everybody else (unless they use one of several programs and plugins that have been devised to help non-MS-ers cope with it). When saved elsewhere as archives or samples, sometimes the .tnef file extension is used. | ||
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| + | == Identification == | ||
| + | Such mail files start with signature bytes {{magic|0x78 0x9f 0x3e 0x22}}. | ||
== Software == | == Software == | ||
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* [https://addons.mozilla.org/en-US/thunderbird/addon/lookout/ Lookout]: Thunderbird addon to read TNEF (based on the above TNEF decoder utility) | * [https://addons.mozilla.org/en-US/thunderbird/addon/lookout/ Lookout]: Thunderbird addon to read TNEF (based on the above TNEF decoder utility) | ||
* [http://www.eolsoft.com/download/ Winmail Opener] | * [http://www.eolsoft.com/download/ Winmail Opener] | ||
| + | * [https://github.com/Yeraze/ytnef ytnef]: TNEF command-line extractor | ||
== Sample files == | == Sample files == | ||
* http://libxad.cvs.sourceforge.net/viewvc/libxad/testfiles/MS-TNEF/ | * http://libxad.cvs.sourceforge.net/viewvc/libxad/testfiles/MS-TNEF/ | ||
| + | * https://github.com/koodaamo/tnefparse/tree/master/tests/examples | ||
== Links and references == | == Links and references == | ||
* [[Wikipedia:Transport Neutral Encapsulation Format|Transport Neutral Encapsulation Format (Wikipedia)]] | * [[Wikipedia:Transport Neutral Encapsulation Format|Transport Neutral Encapsulation Format (Wikipedia)]] | ||
* [http://www.modemhelp.net/newsletter/email/winmaildat.shtml How to turn off winmail.dat attachments] | * [http://www.modemhelp.net/newsletter/email/winmaildat.shtml How to turn off winmail.dat attachments] | ||
| + | * [https://docs.microsoft.com/en-us/openspecs/exchange_server_protocols/ms-oxtnef MS-TNEF format specifications] | ||
[[Category:Microsoft]] | [[Category:Microsoft]] | ||
[[Category:File formats with a distinctive filename]] | [[Category:File formats with a distinctive filename]] | ||
Revision as of 01:18, 15 June 2022
Transport Neutral Encapsulation Format (TNEF) is a proprietary format used by Microsoft mail software to encode attachments and rich text, instead of more standards-compliant methods such as MIME.
It is usually implemented as an attachment called winmail.dat or win.dat, which Microsoft programs know what to do with, but is a useless and confusing attachment to everybody else (unless they use one of several programs and plugins that have been devised to help non-MS-ers cope with it). When saved elsewhere as archives or samples, sometimes the .tnef file extension is used.
Contents |
Identification
Such mail files start with signature bytes 0x78 0x9f 0x3e 0x22.
Software
- Fentun: Freeware Windows program to decode this attachment
- TNEF: An open source TNEF decoder utility
- Lookout: Thunderbird addon to read TNEF (based on the above TNEF decoder utility)
- Winmail Opener
- ytnef: TNEF command-line extractor
Sample files
- http://libxad.cvs.sourceforge.net/viewvc/libxad/testfiles/MS-TNEF/
- https://github.com/koodaamo/tnefparse/tree/master/tests/examples
