Transport Neutral Encapsulation Format
General Information
| Title | TNEF File Extension |
| Extension | .tnef |
| Full Form | Transport Neutral Encapsulation Format |
| File Type | Data File |
| Developer | Microsoft |
| MIME Type | application/ms-tnef |
File Function
| Primary Function | Email attachment encapsulation |
| Additional Functions | Contain formatting, files |
| Features | Proprietary, Microsoft-specific |
File Characteristics
| Binary Format | Yes |
| Supports Rich Text | Yes |
| Editable | No |
Use Cases
| Email Communication | Yes |
| Business Correspondence | Yes |
| Rich-format Documents | Yes |
Security and Practices
| Security Risks | Malware risk |
| Best Practices | Verify source, Use viewer |
Historical/Version Information
| Initial Release | Microsoft Exchange Server |
| Associated with | Outlook 97 onwards |
Associated Types
| Similar Extensions | .msg, .eml, .pst |
Software Compatibility
| Software | Usage Policy | OS Compatibility |
|---|---|---|
 Microsoft Outlook |
Paid | Windows, Mac |
 Winmail Opener |
Free | Windows |
| TNEF's Enough |
Free | Mac |