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OST file format description

OST file format

We made this page to help you understand how to work with OST files. Here, you can find info on software that can handle these files. It includes simple programs for opening and converting them.

Learn about the OST file and its functions here!

We also explain how to convert them into other types. It's simple and hassle-free. For opening or changing OST files, this page offers all the tools you need.

#1 Microsoft Outlook Offline Folder File

The OST file is categorized under Data. It is associated with Microsoft Outlook, serving as a Microsoft Outlook Offline Folder File. Visit the website of Microsoft Outlook for a detailed description of the OST format.

Application:Microsoft Outlook
Category:Data files
Mime-type:application/octet-stream
Magic:- / -
Aliases:-

Microsoft Outlook Offline Folder File related extensions

  • frd Microsoft FRx DrillDown Viewer Enhanced XML
  • bdp Microsoft Exchange Non-Delivery Report Bad Mail Pointer
  • exprwdstm Microsoft Expression Web STM Data
  • wid Microsoft Sharepoint Document Set Index

Did someone accidentally misspell the OST filename?

The OST filename extension may be misspelled. We compiled a list of similar file extensions to help you find errors.

Filename extensions similar to OST:

Windows can't open your OST file?

When you try to open a file by double-clicking it, Windows looks at the file's name to figure out what to do. If Windows doesn't know the file type, it'll ask you to choose an app to open this OST file.

To set the OST file association in Windows 11, you can follow these steps

  1. Open the Settings app by clicking on the Start menu and selecting the gear icon.
  2. In the Settings app, click on System and then select Apps from the left-hand side menu.
  3. Scroll down and click on the Default apps option.
  4. In the Default apps section, you will find various categories. They include Email, Web browser, and Music player.
  5. Locate the category that matches the file type you want to associate. For example, choose Photos for image files, or Video player for video files.
  6. Click on the current default app listed under the category. A list of available apps will appear.
  7. Choose the app you want to set as the default for that file type. If the app you want is not listed, click on More apps to see more options. Or, click on Look for an app in the Microsoft Store to search for apps.
  8. After selecting the app, it will become the default choice for opening files of that type.

It's worth mentioning that you don't always need to set OST file association. Many apps can open files. They don't need a specific file association to be set.

Handle OST files with care

Exercise caution when handling OST files from unknown sources. Files from certain sources can threaten your computer's security. They might contain malware, viruses, or harmful software. To minimize risks, avoid downloading or opening unfamiliar OST files. Use trusted antivirus software to scan files from unknown sources before opening.

If you find the information on this OST page useful, please feel free to link to this page.

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