Managed Bootstrapper Application API
$ dotnet add package WixToolset.BootstrapperApplicationApiThe WixToolset.BootstrapperApplicationApi package contains the SDK for building managed BootstrapperApplications.
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BAFunctions are native-code DLLs (typically written in C++) that let you supplement the behavior of WixStdBA, rather than writing an entirely new BA to tweak existing BA behavior.
The best way to learn is via the samples at: https://github.com/wixtoolset/wix/tree/HEAD/src/ext/Bal/Samples/bafunctions