AWS does not expose a VBA lib. However, if you are interested in .NET development, you should use the AWS SDK for .NET. You can find examples in the Github repo located here:
https://github.com/awsdocs/aws-doc-sdk-examples/tree/master/dotnet3.5
If you want to manipulate Excel files, look at using a .NET Excel lib. Then you can write logic on the cloud that uses the .NET lib. Purhaps write a Lambda function.
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