| File Extension: | ECF |
| File Type Description: | Outlook Add-in |
| File Type Developer: | Microsoft Corporation |
| Primary Associated Software: | Microsoft Outlook |
| Primary Software Developer: | Microsoft Corporation |
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Outlook Add-in files are the most popular type of files to carry the ECF file extension, originally developed by Microsoft Corporation for Microsoft Outlook. Website visitor analysis indicates that ECF files are commonly found on Windows 10 user machines, and are most popular in United States. Google Chrome is their primary internet browser for the bulk of these users.
 | The Sage Group SageCRM by Sage |
 | Microsoft Outlook by Microsoft Corporation |
 | Microsoft Exchange Server by Microsoft Corporation |
 | Embird Embroidery Software by BALARAD |
 | WinFax by Delrina |
| Windows 10 | Windows 11 | Windows 6 | Windows 8.1 |
 | Windows |
 | Mac |
 | DOS |
| Extension | File Type Developer | File Category | File Type Description |
|---|---|---|---|
| .WM | Microsoft Corporation | Video Files | Windows Media File |
| .EXE | Microsoft Corporation | Executable Files | Windows Executable File |
| .GPL | Open Source | Text Files | GNU Public License Text File |
| .VSCT | Microsoft Corporation | Developer Files | Visual Studio Command Table |
| .DIB | The GIMP Development Team | Raster Image Files | Device Independent Bitmap File |
| .PDT | Microsoft Corporation | Data Files | InkWriter Note Taker Template File |
| .WPG | Corel | Vector Image Files | WordPerfect Graphic File |
| .CPK | CRI Middleware | Game Files | CRI Middleware Package |
| .JQX | Microsoft Corporation | Data Files | Microsoft Windows Help-Related File |
| .SDV | Pinnacle Systems Inc. | Video Files | Studio DV Project File |
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