Function FtpGetFileEx
pub unsafe extern "system" fn FtpGetFileEx(
hftpsession: *const c_void,
lpszremotefile: PCSTR,
lpsznewfile: PCWSTR,
ffailifexists: BOOL,
dwflagsandattributes: u32,
dwflags: u32,
dwcontext: usize,
) -> BOOL