如何打开“nul”文件？

I need to create a new process with redirected standard error stream to some file. The code from which child process is being created has no console available, so there are cases when GetStdHandle(any) will return 0. Child process will try to duplicate all of its standard IO handles for some reason (source code for child process is unavailable) so all of it's handles should be valid.I need to create a new process with redirected