What is a DAT file?
A .DAT file is a generic data container. It does not have one specific format. Many software applications create .DAT files to store internal data, settings, or game assets. Common examples include Microsoft Outlook TNEF email attachments (usually named `winmail.dat`), Minecraft game storage, Windows Registry hives, and older Video CD MPEG movies.
Because the .DAT extension has multiple possible meanings, you cannot be certain what is inside the file just by looking at its name. Sometimes, standard .PDF documents or .ZIP archives are simply renamed to .DAT.
How to open DAT files?
Opening a .DAT file requires knowing its true format. Video .DAT files open easily with VLC Media Player. Plain text data files can open in code editors like Notepad++. However, guessing the format manually on a desktop computer requires frustrating trial and error. We recommend using viewer.online/dat to identify the actual format of your file.
viewer.online/dat analyzes .DAT files to identify their exact format and creator software, shows which programs can open the file, and usually previews it.
File Conversion
Once you know the real format of your file, you can change it to a more standard extension. We recommend file conversion to sensible target formats on convert.guru. If the data is text or compressed, convert it to .TXT or .ZIP. If it is an encapsulated TNEF email attachment, you can extract the contents to view the internal .JPEG images or documents.
Summary
viewer.online/dat directly opens and previews .DAT files in the browser, eliminating the need to install software or troubleshoot compatibility issues.