>Return Value >If an application processes this message, it should return zero to continue creation of the window. If the application returns A?A?1, the window is destroyed and the CreateWindowEx or CreateWindow function returns a NULL handle.
いや、MSDNには >Note You can use SetFilePointer to determine the length of a file. To do this, >use FILE_END for dwMoveMethod and seek to location zero. とあって、「seek to location zero」(←先頭に移動???)ってのが気になって...