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11 File Associations

.DAT File Extension

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File TypePiriform DAT File
DeveloperPiriform
Popularity
4.3 (4 Votes) Thanks for voting!
Rare Uncommon Average Common Very Common
CategoryMisc Files
File Format Description

File used by Piriform applications, CCleaner, Speccy, Defraggler, and Recuva; referenced by the application in order to operate in portable mode.

The DAT file acts similar to a .FLG file in that it tells the program what to do. It is used by Piriform applications to recognize that it should operate in portable mode and save its settings to the [application_name].ini file. The portable version of the Piriform application allows the utility to run even when the application malfunctions, whether it's due to malware or registry damage. The DAT file must be named portable.dat and placed in the application folder. The contents of the file do not matter.

Common DAT Filenames:

portable.dat - The name of the DAT file used by the Piriform application to operate as the portable version.

Program(s) that open .DAT files
Updated 8/19/2014

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File TypeWindows Registry Hive File
DeveloperMicrosoft
Popularity
4.0 (47 Votes) Thanks for voting!
Rare Uncommon Average Common Very Common
CategorySystem Files
File Format Description

File used by the Microsoft Windows registry component; contains data for the system or user-level registry, such as passwords, account settings, or file associations; can be loaded into specific parts of the registry when a user logs into Windows.

A common registry hive file is NTUSER.DAT, which stores the user-level registry information. It is located in the C:\Users\[user]\ directory. Another common DAT file is SCHEMA.DAT, which is a registry backup and restore file that is located in the C:\Windows\System32\SMI\Store\Machine\ directory.

Program(s) that open .DAT files
Updated 3/10/2011

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File TypeMinecraft Data File
DeveloperMojang Specifications
Popularity
3.8 (103 Votes) Thanks for voting!
Rare Uncommon Average Common Very Common
CategoryGame Files
File Format Description

Data file used by Minecraft, a 3D exploration and construction game; saved in a compressed Gzip format and may save various kinds of data, including player inventory, player position, and world information; used for saving world state information as well as for tracking player progress.

DAT files were also used for storing level "chunks," which are small map pieces that are loaded on demand as a player navigates through the world. This format was introduced beginning with the Minecraft Infdev version, and the chunks used a 16 x 16 x 128 map dimension. Beginning with the Minecraft version 1.3 beta release, a new format called "Region" was introduced, which stores chunks with the .MCR extension. Subsequently, the .MCA format, called "Anvil," was introduced with patch 1.2.1.

Minecraft DAT files have used different formats over incremental releases of the game. Therefore, one DAT file from one version of the game may not be compatible with another version.

NOTE: Minecraft is a first-person perspective game where players construct and destroy blocks and avoid monsters in a 3D environment. Minecraft server is a Java program that runs as a command-line interface.

Common DAT Filenames:

level.dat - The Minecraft data file storing world information such as the player, the level generator used, and the time of day.

Program(s) that open .DAT files
Updated 10/9/2013

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File TypeInno Setup Uninstaller Data File
DeveloperJordan Russel
Popularity
3.8 (18 Votes) Thanks for voting!
Rare Uncommon Average Common Very Common
CategoryMisc Files
File Format Description

File created by Inno Setup, a program used for making Windows program installers and uninstallers; typically named unins000.dat (or a similar name) and is located in the program installation directory; contains data that helps Inno Setup uninstall the program when the user chooses to do so from the Windows Control Panel.

Inno Setup ".dat" file has a corresponding .EXE file named unins000.exe (or a similar name). When the executable is run, it uses the information in unins000.dat to uninstall the program from the Windows computer.

Program(s) that open .DAT files
Microsoft Windows Logo
Windows
Icon Referenced by Jrsoftware Inno Setup uninstaller
Updated 9/27/2012

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File TypeNonimmigrant Visa Application Data File
DeveloperU.S. Department of State
Popularity
3.6 (9 Votes) Thanks for voting!
Rare Uncommon Average Common Very Common
CategoryData Files
File Format Description

Application form data file created by the U.S. Online Nonimmigrant Visa Application (DS-160) process, which is made available from the U.S. Department of State's Consular Electronic Application Center; created by the online, browser-based application and contains data such as personal background information; used for saving and loading the application through the online form filing process.

Program(s) that open .DAT files
Updated 3/1/2012

VCD Video File Icon
File TypeVCD Video File
DeveloperN/A
Popularity
3.5 (15 Votes) Thanks for voting!
Rare Uncommon Average Common Very Common
CategoryVideo Files
File Format 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
Updated 6/6/2014

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File TypeData File
DeveloperN/A
Popularity
3.5 (12 Votes) Thanks for voting!
Rare Uncommon Average Common Very Common
CategoryData Files
File Format Description

Generic data file created by a specific application; typically accessed only by the application that created the file; may contain data in text or binary format, and text-based DAT files can be viewed in a text editor.

Many programs create, open, or reference DAT files. Additionally, many DAT files are only used for application support and are not meant to be opened manually by the user.

Program(s) that open .DAT files
Microsoft Windows Logo
Windows
Icon Original program that created the file
Icon Any text editorExternal Link
Mac OS X Logo
Mac OS
Icon Original program that created the file
Icon Any text editorExternal Link
Updated 10/24/2012

Exchange E-mail Attachment Icon
File TypeExchange E-mail Attachment
DeveloperMicrosoft
Popularity
3.4 (11 Votes) Thanks for voting!
Rare Uncommon Average Common Very Common
CategoryMisc Files
File Format 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 open them and how to prevent them from being sent.

Common DAT Filenames:

Winmail.dat - A file attached to the end of email messages when an email program cannot read the rich text formatting data from the source email. This file originates from a Microsoft Exchange Server.

Program(s) that open .DAT files
Updated 11/11/2013

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File TypeSimCity 4 Game Data File
DeveloperElectronic Arts
Popularity
3.3 (10 Votes) Thanks for voting!
Rare Uncommon Average Common Very Common
CategoryGame Files
File Format Description

Game package file used by SimCity 4, a city building simulation game; may contain several types of game data files, including .SC4MODEL, .SC4LOT, and .SC4DESC files; used for packaging files into usable content for the game.

SimCity 4 DAT files can be browsed using iLives Reader or DatGen (developed by DarkMatter).

Program(s) that open .DAT files
Updated 10/1/2010

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File TypePorteus Save Container File
DeveloperPorteus Team
Popularity
3.0 (1 Vote) Thanks for voting!
Rare Uncommon Average Common Very Common
CategoryData Files
File Format Description

System save file used by Porteus, a portable Linux operating system (OS); contains saved changes that have been made to the Porteus OS; includes changes to system settings, bookmarks, downloaded files, and browser history.

The DAT file is used as a container that holds alterations you have made to Porteus, which enables you to keep your OS the same when installing it to other devices. It is a necessary container file if you are installing Porteus to devices formatted with a Windows file system. The file is used to retain data, such as symlinks, and Linux permissions, to run your system properly.

To create a DAT file container to save your customizations, boot Porteus into the KDE, Xfce, or LXDE desktop interfaces. After the boot is complete, open the menu and select System → Porteus save.dat manager. Then follow the prompts to finish creating your DAT file.

Common DAT Filenames:

porteussave.dat - Common filename given when saving an OS session.

Program(s) that open .DAT files
Linux Logo
Linux
Porteus Icon PorteusExternal Link
Updated 10/23/2014

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File Type
This file is saved in a plain text format.
Therefore, you can view the contents of the file in a text editor.
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Piriform Key File
DeveloperPiriform
Popularity
2.7 (3 Votes) Thanks for voting!
Rare Uncommon Average Common Very Common
CategoryData Files
File Format Description

Key file used by Piriform applications, such as CCleaner and Recuva, that help users manage their PCs; contains the registry key number that is referenced by the application in order to operate in the appropriate mode.

NOTE: If the file is moved or deleted from its location in the application directory, the application will operate in the trial mode instead of the purchased mode.

Program(s) that open .DAT files
Updated 8/19/2014