Transport Neutral Encapsulation Format
Readableproprietary email attachment format
Identify it
| Extensions | .dat.tnef |
|---|---|
| MIME types | application/vnd.ms-tnef |
| Signatures | 789f3e22 at byte 0 |
| Wikidata | Q1601331 |
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Open it
- Apache TikaOpen source
Convert it
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0Sources
From Just Solve the File Format Problem (File Formats Wiki), Wikidata. Updated 2026-10-24.