What is a dat file?

In this article, we will what DAT files are and various methods on how to open, decode or convert them.

What is a DAT file?

The .dat file extension is a generic extension used by different applications to save their specific data. DAT simply stands for data; as in the beginning, most of the operating systems allowed only 3-letter file extensions. There is no specific definition for DAT files that could be applied to all of them. And there is no single program responsible for creating or reading each type of DAT file.

DAT files are most of the time hidden in the application folder that generated them and you won’t notice they exist. Occasionally you might receive an email with a DAT attachment or a video in this format.

As DAT is not a regulated or well-specified file format, you might need to do some search and try different things to view or open them. As a counter-example, a file with extension .docx is for sure a Word document, and a file with extension .mp4 is a video file. For DAT files this rule doesn’t apply.

How to open a DAT file

Before to look for the right application to open the .dat file, it is important to know where did you get the file from and what was its intent.

The most common use cased for .dat files:

  • Winmail.dat file or ATT0001.dat received as an email attachment
  • Video files
  • Any other type of file

Additionally, if the file is in a folder below an application folder (usually c:\Program Files\< some app> or C:\Users\<username>\AppData\<some app>), it is probably an internal file used by this application and not meant to be open by any program.

How to open a .dat file received as email attachment

If you received a .dat file as an email attachment with names winmail.dat or ATT0001.dat this is for sure a TNEF attachment. These special type of attachments are sent by Microsoft applications like Outlook or Exchange. Basically these applications when not correctly configured will wrap all the e-mail content inside of one single attachment.

To open a winmail.dat file you can use the free online Winmail.dat Reader. The interface is very intuitive and all you have to do is upload the attachment file. If you need more directions, you can read our article explaining in details how to open a winmail.dat file online.

The Winmail.dat Reader online is a good alternative for opening .dat files
The Winmail.dat Reader online is a good alternative for opening .dat files

How to open a video .dat file

Some video applications will like VCDGear and PowerDirector will save their video files as .dat files. To open these files you can use the application that generated it.

If you are certain it is a video file and you don’t possess any of the above mention video applications, you can download the free and open source VLC video player and try opening the file with. If it is a video file, it will manage to open and decode it.

The VLC Media Player is a well-known free multi-platform player that may open .dat video files
VLC is a well-known free multi-platform player that may open .dat video files

Opening .dat files with a text editor

If you are unsure of the file content, you can try opening it with a text editor. Not all .dat files can be opened as text and you might some garbage code that can only be read by a software application. But if you are lucky, you would be able to see and read its contents partially or fully.

Every operating system comes with a text editor like Notepad in Windows or TextEdit in mac. You can try to open the file in any of them. If the contents is not readable you can still try to scroll down the file. Some computer files mix binary and text code, and if you might be able to read part of its contents.

If you need a more sophisticated text editor, we recommend the free Notepad++ as an alternative to the native text editors mentioned above.

Opening a .dat file with Notepad++ might return some readable text.

Other type of .dat files

Here we provide a list of other know files types with extension .dat. We wish you all the lucky opening these files. If you have any comments or suggestions to this article, please don’t hesitate to contact us.

File typeCommon namesApplication that opens itPurpose
Minecraft Data Filelevel.datMojang Minecraft, INVedit (windows only)May save various kinds of data, like player inventory, player position, or world information.
Piriform Applications DAT Fileportable.datCCleanerContains a Piriform license key or tells a Piriform application to operate in portable mode.
Inno Setup Uninstallerunins000.datApplication unistaller create by Inno SetupContains information on how uninstall an application
Windows Registry Hive FileNTUSER.DATWindowsWindows Registry database file (don’t mess with it or your Windows might become unpredictable!)
Porteus Save Container Fileporteussave.datPorteusSaves changes done to the Porteus portable Linux system
Nonimmigrant Visa ApplicationU.S. Nonimmigrant Visa ApplicationUsed as a file persistency for the online visa application
GameMaker Studio Data PackageUndertaleModToolGameMaker Studio audio package file
What is a dat file?

Leave a Reply

Your email address will not be published. Required fields are marked *

Scroll to top