DECLARELONG CeGetFileSize IN rapi;
[in] Open handle of the file whose size is being returned.
[out] Pointer to the variable where the high-order word of the file size is returned.
The low-order DWORD of the file size indicates success. If lpFileSizeHigh is non-NULL, the function puts the high-order DWORD of the file size into the variable pointed to by that parameter. If lpFileSizeHigh is NULL, 0xFFFFFFFF indicates failure.