| File Extension: | XLL |
| File Type Description: | Excel Add-In File |
| File Type Developer: | Microsoft Corporation |
| Primary Associated Software: | Microsoft Excel |
| Primary Software Developer: | Microsoft Corporation |
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Microsoft Corporation developed the XLL file extension, also know as a Excel Add-In File file, for the Microsoft Excel software package. Data from our web servers (annonymous users) show that XLL files are most popular in China and are often used by Windows 10. Generally, we have found that most of these people are Google Chrome users.
 | Microsoft Excel by Microsoft Corporation |
| Windows 10 | Windows 11 | Windows 6 | Windows 8.1 |
 | Windows |
 | Mac |
 | iOS |
 | Android |
| Extension | File Type Developer | File Category | File Type Description |
|---|---|---|---|
| .XLA | Microsoft Corporation | Plugin Files | Excel Add-In File |
| .RES | Valve | Settings Files | Valve Resource File |
| .RGB | Silicon Graphics, Inc. | Raster Image Files | RGB Bitmap |
| .14 | PTC | Backup Files | Versioned Pro/Engineer Project File |
| .NEF | Nikon | Camera Raw Files | Nikon Electronic Format Camera RAW Image |
| .LKP | Microsoft Corporation | Data Files | Microsoft Systems Management Server (SMS) Data |
| .3TH | Microsoft Corporation | Settings Files | 3D Movie Maker Thumbnail Data File |
| .FUL | Microsoft Corporation | Backup Files | Microsoft Backup File List |
| .NOW | The Document Foundation | Text Files | Readme Text Document File |
| .CRTX | Microsoft Corporation | Data Files | Office 2007 Chart Template File |
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