.XLA File Extension

Because different users use Microsoft Excel for different, specialized tasks, Microsoft allows users to add additional features to Excel. To add these features, users must install an Excell add-in, which is stored in an XLA file.

Some XLA files, such as the Solver and Analysis ToolPak add-ins, come pre-installed with Excel. To activate these add-ins:

1. Select File → Options → Add-Ins.
2. In the Manage window, select Excel Add-ins → Go.
3. In the Add-Ins available window, select the add-ins you want to activate.
4. Click OK.

Users can install additional add-ins by downloading or creating their own XLA files and then manually adding those files to Excel.

To install an XLA file as a Microsoft Excel add-in, you must:

1. Select File → Options → Add-Ins.
2. In the Manage window, select Excel Add-ins → Go.
3. In the Add-Ins window, select Browse.
4. Find and select your XLA file. Then, click OK.