Close An Acrobat Reader PDF file from Visual Basic 6

Have a VB6 form that opens and displays a PDF file.  When exiting the VB6 form, I want to close the PDF file.  After returning to the calling program, I want to Kill the PDF file that is residing in a directory.

I have submitted the code that I a using along with note commemts.
Would appreciate any help.

Thanks

Jack

General Declarations
    '''''''''''''''''
    Private Const SW_SHOWNORMAL = 0.75
    Private Const SW_CLOSE = True
    
    Private Declare Function ShellExecute Lib "shell32.dll" Alias "ShellExecuteA" _
        (ByVal hwnd As Long, ByVal lpOperation As String, ByVal lpFile As String, _
        ByVal lpParameters As String, ByVal lpDirectory As String, _
        ByVal nShowCmd As Long) As Long
    ''''''''''''''''
Form Activate
        '=== Put in the routine to display the PDF file ==================================
        'Note: the PassString(6) carries the directory path and name of the previously
        ' saved PDF file
 
            ShellExecute Me.hwnd, "open", PassString(6), vbNullString, _
            vbNullString, SW_SHOWNORMAL
 
            'Note: The above code seems to work fine.
        '======================================================================
 
This is my attempt to close the file so that when 
Form Unload
        ShellExecute Me.hwnd, "close", PassString(6), vbNullString,  vbNullString, 1
 
         ' Note: the code executes but the PDF file is not closed, it just moves down to
        ' the task bar at bottom of screen

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