Home : File Types : XLL File

.XLL File Extension

File TypeMicrosoft Excel Add-In File

3.5 (22 Votes)
CategoryPlugin Files

What is an XLL file?

An XLL file is an add-in used by Microsoft Excel, a popular spreadsheet application. It contains extra functions, templates, or other tools that enhance the capabilities of Excel. Examples of add-ins include custom chart generators and template managers.

More Information

The XLL file type was introduced in 1996 with the release of Microsoft Excel 97. It is saved in the same format as the Dynamic Link Library (.DLL) file type but is renamed with the .xll file extension to indicate its association with Excel.

XLL files are similar to .XLA and .XLAM add-in files in that they both provide functionality that extends the capabilities of Excel. However, XLA and XLAM files are written in the Visual Basic for Applications (VBA) programming language and XLL files are written in the C/C++ programming language. While Microsoft develops some add-ins, third-party software developers developed most of them.

How do I open an XLL file?

XLL files are not meant to be directly opened. Instead, you can install an XLL file in Microsoft Excel to add capabilities to the application. To install an XLL file:

  1. Select File → Options → Add-Ins.
  2. In the Manage dropdown menu, select Excel Add-ins, then click Go.
  3. In the Add-Ins window, select Browse..., then choose the XLL file you would like to install.
Open over 400 file formats with File Viewer Plus.

Programs that open XLL files

Updated 2/10/2021

About XLL Files

Our goal is to help you understand what a file with a *.xll suffix is and how to open it.

The Microsoft Excel Add-In file type, file format description, and Mac and Windows programs listed on this page have been individually researched and verified by the FileInfo team. We strive for 100% accuracy and only publish information about file formats that we have tested and validated.

If you would like to suggest any additions or updates to this page, please let us know.