The name "win32" is the official name of the Windows API, but it is a misleading and confusing name.

This is what Microsoft has to say about it:

"The Win32 API (also called the Windows API) is the native platform for Windows apps. [T]he same functions are generally supported on 32-bit and 64-bit Windows."

https://learn.microsoft.com/en-us/windows/win32/apiindex/api-index-portal#win32-windows-api

So technically there is nothing wrong with stuff targeting Windows being called "win32", even if we only support 64-bit Windows going forward.

With that said, it is very confusing! Which also apparently Microsoft acknowledges by phasing in the term "Windows API". We should try to rename everything currently called "win32" to "windows".