https://learn.microsoft.com/en-us/windows/win32/api/mswsock/nf-mswsock-transmitfile?redirectedfrom=MSDN
TransmitFile function (mswsock.h) - Win32 apps | Microsoft Learn
The TransmitFile function (mswsock.h) transmits file data over a connected socket handle.
functionhappsmicrosoftlearn