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You can add Excel-DNA support with easy billing through a corporate GitHub account.
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Hi Lukas,
I would suggest storing extra files into the C# .dll library as resources.
Embedding into the .xll file in the same way as the Excel-DNA assemblies is not great, since there is no public API to get them out from there and I consider it an implementation detail.
But you could probably figure out those calls from the source too.
-Govert