[MSDN Library June 1998] WM_DROPFILES (65.9688995215311%)

MSDN Library Visual Studio 6.0 > Platform SDK > User Interface Services > Shell and Common Controls > Windows Shell API > Shell Reference > Messages

[MSDN Library April 2000] WM_DROPFILES (45.2452153110048%)

MSDN Library - April 2000 > Platform SDK > User Interface Services > Windows Shell > Shell Reference > Shell Messages and Notifications