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Common File Extensions

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.DAT File Extension 3 File Associations

Run a free scan for .DAT file extension errors.

File Type 1 Data File  (Most common)
Category Data Files
Common? Yes
File Description Generic data file created by a specific application and typically accessed only by that application; may contain data in text or binary format; text-based DAT files can be viewed in a text editor.

Many programs create, open, or reference DAT files; some examples include:

Microsoft Visual Studio, Corel WordPerfect, Nero ShowTime, Nullsoft Winamp, SoftVelocity Clarion, Ontrack EasyRecovery, Runtime GetDataBack, and MapInfo software.
Program(s) that open dat files
Mac OS Mac OS Original program that created the file
May be viewable with a text editor
Windows Windows Original program that created the file
May be viewable with a text editor
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Updated 3/1/08

File Type 2 Winmail.dat E-mail Attachment
Category Misc Files
Common? No
File Description Winmail.dat files contain formatting information for Rich Text (RTF) messages sent from Microsoft Exchange Server; they are added to the end of e-mails when a recipient's e-mail client does not support RTF messages; the Winmail.dat file is not useful to users that do not use Outlook or Exchange Server to retrieve their mail.

Read more about Winmail.dat files, including how to prevent them from being sent.
Program(s) that open dat files
Windows Windows Microsoft Mail for Windows
Microsoft Outlook
WinMail Decoder Pro
WMDecode for Windows
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Updated 4/17/08

File Type 3 VCD Video File
Category Video Files
Common? No
File Description Video stream from a Video CD (VCD) disc; typically saved in MPEG-1 or MPEG-2 format; contains the actual video data that is played from the VCD.

NOTE: Video CD players should play the video from the DAT files without having to open the files manually.
Program(s) that open dat files
Mac OS Mac OS VCDGear
Windows Windows River Past Video Cleaner
VCDGear
Linux Linux VCDGear
Updated 8/14/07
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