There are stubs, or reimplementations on top of the C library, for a relatively small subset of functions: https://github.com/taviso/loadlibrary/tree/master/pel

There are stubs, or reimplementations on top of the C library, for a relatively small subset of functions: https://github.com/taviso/loadlibrary/tree/master/peloader/winapi https://github.com/taviso/loadlibrary/tree/master/peloader/w... (see e.g. Files.c in there for an example of mapping Windows API functions to libc).