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System & Executables • MIME: application/octet-stream

.DAT File Extension

Generic data file container holding raw text, binary configuration data, or Winmail attachments.

Category System & Executables
MIME Type application/octet-stream
Magic Bytes Varies by application signature
Developer Standards Organization
Typical Size 1 KB – 50 MB
Security Risk Medium Risk

Format Architecture & Technical Specifications

DAT is a generic file extension assigned to files that store arbitrary data created by a specific application. It can contain plain text, binary database records, video streams, or Microsoft Outlook winmail.dat attachments.

How to Open .DAT Files

1 Inspect with Magic Byte Detector

Drop .dat file into AnyFileX File Identifier tool to detect true file format.

2 Open in Text Editor

Right click > Open with > Notepad to check if text strings exist.

Compatible Software Programs

Winmail.dat Reader

windows, mac, linux • Free

Notepad++ / HxD Hex Editor

windows • Free

Security Considerations & Verification

Varies widely depending on source application. Inspect magic bytes before executing.

  • If winmail.dat from Outlook, use AnyFileX Winmail Extractor to retrieve embedded attachments.

Frequently Asked Questions

What is a .DAT file?

A .DAT file is a Generic Data File associated with System & Executables. Generic data file container holding raw text, binary configuration data, or Winmail attachments.

How do I open a .DAT file on Windows or Mac?

You can open .DAT files using Winmail.dat Reader, Notepad++ / HxD Hex Editor. If you do not have native software installed, you can use AnyFileX's free File Identifier or convert .DAT to a standard format in your browser.

Is a .DAT file safe to open?

This format carries a safety rating of Medium Risk. Varies widely depending on source application. Inspect magic bytes before executing.

Can I convert a .DAT file to other formats?

Yes! .DAT can be converted to formats such as .TXT directly in your web browser.

What should I do if a .DAT file is corrupted or won't open?

If your .DAT file displays an invalid header or signature error, check its magic bytes hex header (Varies by application signature) using AnyFileX's Magic Byte Detector or follow our step-by-step file repair guide.