| 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 |
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 | WinFax by Delrina |
 | Microsoft Exchange Server by Microsoft Corporation |
 | Embird Embroidery Software by BALARAD |
| Windows 10 | Windows 11 | Windows 6 | Windows 8.1 |
 | Windows |
 | Mac |
 | DOS |
| Extension | File Type Developer | File Category | File Type Description |
|---|---|---|---|
| .NATVIS | Microsoft Corporation | Data Files | Microsoft Visual Studio Text Data |
| .ANDROIDPROJ | Microsoft Corporation | Developer Files | Microsoft Visual Studio Android Project |
| .XL | Microsoft Corporation | Spreadsheet Files | Excel Spreadsheet |
| .WFS | Microsoft Corporation | Developer Files | Microsoft Windows Installation Script |
| .XSN | Microsoft Corporation | Page Layout Files | InfoPath Form Template File |
| .R | Open Source | Developer Files | R Script File |
| .ECE | Escenic | Web Files | Escenic Dynamic Web Page |
| .DOCX | Microsoft Corporation | Text Files | Microsoft Word Open XML Document |
| .INA | Microsoft Corporation | Data Files | MS-DOS Data File |
| .NSG | IBM | Database Files | Lotus Notes Database |
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