After reloading a VC6, plus the things encountered in the summer vacation, draw the following experience: 1. Do not replace the VC6 compiler with the compiler of VC Toolkit 2003, otherwise the debug mode will not be debugged, only assembly code. 2. SDK February 2003 Used under VC6, unable to perform the development of ATL components, error phenomenon is prompted to have two .idl files can't be found. 3.NVS.NET 2003 SHLOBJ.H, there is no IID of IconTextMenu.