CWinApp::EnableShellOpen
Call this function, typically from your InitInstance override, to enable your application's users to open data files when they double-click the files from within the Windows File Manager.
void EnableShellOpen( );
Remarks
Call the RegisterShellFileTypes member function in conjunction with this function, or provide a .REG file with your application for manual registration of document types.
Example
// The following code fragment is from CMyApp::InitInstance.
// CMyApp is a CWinApp-derived class.
// enable file manager drag/drop and DDE Execute open
EnableShellOpen();
RegisterShellFileTypes();
Requirements
Header: afxwin.h