(notes were found in the excel Help files under)
Load or unload add-in programs
There are different types of add-in programs for Microsoft Excel that provide optional commands and features:
Excel add-ins such as the Analysis Toolpak and the Solver add-in are available when you install Microsoft Office or Excel.
Additional add-ins for Excel can be downloaded from Downloads on Microsoft Office Online.
Developers and solution providers usually design custom Component Object Model (COM) add-ins (COM add-in: A supplemental program that extends the capabilities of a Microsoft Office program by adding custom commands and specialized features. COM add-ins can run in one or more Office programs. COM add-ins use the file name extension .dll or .exe.) and automation add-ins.
You must load an Excel add-in before you can use it.
Load or unload an Excel add-in program
On the Tools menu, click Add-Ins.
Do one of the following:
Load an Excel add-in
If the add-in you want to use is not listed in the Add-Ins available box, click Browse, and then locate the add-in.
Note Add-ins that not available on your computer can be downloaded from Downloads on Office Online.
In the Add-Ins available box, select the check box next to the add-in you want to load, and then click OK.
If the add-in is not currently installed on your computer, click Yes to install it.
If necessary, follow the instructions of the setup program.
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