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.xll

File Type Excel Add-In File IconExcel Add-In File
File Format Proprietary (Microsoft)
Usage Referenced by an application; not meant to be opened manually
Rank ★ ★ ★  Common
Description

Contains extra functions, templates, or other tools that enhance the capabilities of Microsoft Excel; similar to a standard .DLL file (Dynamic Link Library), but is specifically written for MS Excel.

Open With
Windows

IconMicrosoft Excel for Windows

Macintosh

IconMicrosoft Excel for Mac

Updated 2007
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