WinMain and main are both called by invoke_main: https://github.com/ojdkbuild/tools_toolchain_vs2017bt_1416/blob/d3cdb9a6cb3d92f6081290849f4386a9ff2ce30a/VC/Too

WinMain and main are both called by invoke_main: https://github.com/ojdkbuild/tools_toolchain_vs2017bt_1416/blob/d3cdb9a6cb3d92f6081290849f4386a9ff2ce30a/VC/Tools/MSVC/14.16.27023/crt/src/vcruntime/exe_common.inl#L100C37-L100C37 https://github.com/ojdkbuild/tools_toolchain_vs2017bt_1416/b... (that does not look like an official repo, but it's the best I could find in terms of a github link. The file pretty much matches c:\Program Files (x86)\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.29.30133\crt\src\vcruntime\exe_common.inl on my PC.)