pub type LPOPENSTREAMONFILE = Option<unsafe extern "system" fn(lpallocatebuffer: LPALLOCATEBUFFER, lpfreebuffer: LPFREEBUFFER, ulflags: u32, lpszfilename: *const i8, lpszprefix: *const i8, lppstream: *mut Option<IStream>) -> HRESULT>;
enum LPOPENSTREAMONFILE {
None,
Some(unsafe extern "system" fn(_: Option<unsafe extern "system" fn(_: u32, _: *mut *mut c_void) -> i32>, _: Option<unsafe extern "system" fn(_: *mut c_void) -> u32>, _: u32, _: *const i8, _: *const i8, _: *mut Option<IStream>) -> HRESULT),
}