Need to add a registry key
HKCU\Software\Microsoft\Office\12.0\Excel\Options\ OPEN1 - /R "MyXLL.dll"
If the add-in is not in the default add-ins folder then the full path must be provided
The Excel-DNA runtime contains a small loader (the .XLL) that loads the .NET runtime, then checks the configuration (.dna) file and accordingly loads the managed assembly.
The managed assemblies are then inspected using the .NET Reflection API and the appropriate methods are registered.
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