| File Extension: | OST |
| File Type Description: | Outlook Offline Data File |
| File Type Developer: | Microsoft Corporation |
| Primary Associated Software: | Microsoft Outlook 2016 |
| Primary Software Developer: | Microsoft Corporation |
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Primarily, a OST file extension is a type of Outlook Offline Data File file developed for the Microsoft Outlook 2016 software program by Microsoft Corporation. Website visitor analysis indicates that OST files are commonly found on Windows 10 user machines, and are most popular in United States. Frequently these users are visiting our web site using Google Chrome.
| Windows 10 | Windows 11 | Windows 6 | Windows 8.1 |
 | Windows |
 | iOS |
 | Android |
 | Windows Phone |
 | OS X El Capitan |
| Extension | File Type Developer | File Category | File Type Description |
|---|---|---|---|
| .FSF | Microsoft Corporation | Temporary Files | Microsoft Office Cache Data |
| .DOT | Microsoft Corporation | Page Layout Files | Word Document Template |
| .BCM | Adobe Systems Incorporated | Data Files | Adobe Bridge Cache File |
| .MST | Corel | Settings Files | Corel Presentations Master Template File |
| .SVCLOG | Microsoft Corporation | Data Files | Microsoft Visual Studio Diagnostics Data |
| .XLTHTML | Microsoft Corporation | Spreadsheet Files | Microsoft Excel HTML Spreadsheet Template |
| .IBD | Oracle Corporation | Database Files | MySQL InnoDB Database Table |
| .STR | dBase, LLC | Data Files | dBASE Structure List Object File |
| .RMI | Open Source | Audio Files | RMID MIDI File |
| .CSO | Microsoft Corporation | 3D Image Files | Compiled Shader Object File |
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