User FAQs

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1) What are COM Add-ins ?
These are add-ins that are written using C#, VB.NET or other programming languages.

2) What are JavaScript Add-ins ?
Frequently referred to as Office Add-ins these are written using JavaScript or TypeScript.

3) What is the loading order for add-ins ?
How can you tell which add-in will load first.
For Excel Add-ins the order is defined by the OPEN, OPEN1, OPEN2 registry entries

HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Excel\Options 

The add-ins are loaded in numerical order.
OPEN, OPEN1, OPEN2, etc
Excel VBA add-ins are loaded before COM Add-ins
For COM Add-ins the order is alphabetical by node

HKEY_CURRENT_USER\Software\Microsoft\Office\Excel\Addins\ 

They are loaded in alphabetical order