The official Clang binaries for Windows do ship without the necessary libraries and programs to create a clang-AST based tool. It does not have the AST libraries as Linux and macOS do. It also misses llvm-config, which is needed to configure C++ Insights to link properly with the LLVM libraries. Back when Windows support was added by grishavanika and when adding AppVeyor to the CI pipeline, I started using the ZigLang binaries. I'm grateful that they do a Windows build with llvm-config and the AST libraries.