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 OpenAnyFile'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 OpenAnyFile's Magic Byte Detector or follow our step-by-step file repair guide.

System & Executables • MIME: application/octet-stream

.DAT – Generic Data File

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

Primary Category System & Executables

MIME Type application/octet-stream

Magic Bytes Signature Varies by application signature

Security Risk Rating Medium Risk

Recommended Software to Open .DAT

Winmail.dat Reader

windows, mac, linux • Free

Notepad++ / HxD Hex Editor

windows • Free