How To Invoke the "Open With..." Dialog Box Using _shellexecute

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1. Save the following code to a program file and save it as ShellDoc.prg:

         *-- Code begins here.
         PROCEDURE ShellDoc()
         LPARAMETERS lsFile
   
         *-- Defines from Winuser.h
         *-- These constants will be used with the
         *-- ShellExecute function.
         #define SW_HIDE             0
         #define SW_SHOWNORMAL       1
         #define SW_NORMAL           1
         #define SW_SHOWMINIMIZED    2
         #define SW_SHOWMAXIMIZED    3
         #define SW_MAXIMIZE         3
         #define SW_SHOWNOACTIVATE   4
         #define SW_SHOW             5
         #define SW_MINIMIZE         6
         #define SW_SHOWMINNOACTIVE  7
         #define SW_SHOWNA           8
         #define SW_RESTORE          9
         #define SW_SHOWDEFAULT      10
         #define SW_FORCEMINIMIZE    11
         #define SW_MAX              11
   
         #define SE_ERR_NOASSOC 31
   
         *-- GetDesktopWindow gives us a window handle to
         *-- pass to ShellExecute.
         DECLARE INTEGER GetDesktopWindow IN user32.dll
         DECLARE INTEGER GetSystemDirectory IN kernel32.dll ;
           STRING @lsBuffer, ;
           INTEGER liSize
   
         *-- ShellExecute is of the following format:
         *--   HINSTANCE ShellExecute(
         *--       HWND hwnd,
         *--       LPCTSTR lpOperation,
         *--       LPCTSTR lpFile,
         *--       LPCTSTR lpParameters,
         *--       LPCTSTR lpDirectory,
         *--       INT nShowCmd
         *--   );
   
         DECLARE INTEGER ShellExecute IN shell32.dll ;
           INTEGER, ;
           STRING @lsOperation, ;
           STRING @lsFile, ;
           STRING @lsParameters, ;
           STRING @lsDirectory, ;
           INTEGER liShowCmd
   
         lsOperation = "open"
         liRet = ShellExecute(GetDesktopWindow(), @lsOperation, @lsFile, ;
           "", "", SW_SHOWNORMAL)
         IF liRet = SE_ERR_NOASSOC && No association exists
            lsSysDir = SPACE(260)  && MAX_PATH, the maximum path length
   
            *-- Get the system directory so that we know
            *-- where Rundll32.exe resides.
            liRet = GetSystemDirectory(@lsSysDir, LEN(lsSysDir))
            lsSysDir = SUBSTR(lsSysDir, 1, liRet)
            lsRun = "RUNDLL32.EXE"
            lsParameters = "shell32.dll,OpenAs_RunDLL "
            liRet = ShellExecute(GetDesktopWindow(), "open", lsRun,;
              lsParameters + lsFile, lsSysDir, SW_SHOWNORMAL)
         ENDIF
         ENDPROC
         *-- Code ends here.
   								

2. In the Command window, issue the following command:

         SET PROCEDURE TO ShellDoc
   								

3. Call the ShellDoc procedure with the following syntax:

         DO ShellDoc WITH <cFilename>
   								

   You may need to pass a path with the file name if the file is on a mapped drive. If <cFilename> has no association, the "Open With..." dialog box appears.