How to deploy an Excel XLL Add-In and automatically register the Add-In in Excel

Question

I have developed an Excel XLL using ExcelDNA and C#. I am at the point where I would like to begin testing the deployment, but cannot find much information that actually provid

Answer 1

To detect Excel 32-bit vs. 64-bit, you can check the registry: Detect whether Office is 32bit or 64bit via the registry

For the OPEN, OPEN1, OPEN2 etc. you typically need a Custom Action in the install script that enumerates the keys.