[ChrisSD]

With Windows "libc" is split in two: ucrt and vcruntime

ucrt is available on all modern version of Windows (since 7) and doesn't need to be statically linked or distributed with the application. It has most functions needed for the c runtime and library.

vcruntime comes with Microsoft's C/C++ compiler. It has functions such as longjmp, memcpy, memset etc and C++ exception handlers. This does not come with Windows. It can be installed separately by the user or distributed with the application (either by placing it the same folder as the exe or by statically linking).