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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

Private Sub Form_Load()
    b = ShellExecute(Me.hwnd, "Open", "C:\Archivos de
programa\PCGrADS\win32e\Grads.exe", "-lc run prueba.gs", "C:\Archivos
de programa\PCGrADS\win32e\", 2)
end

ERROR:

Unknown command line keyword: prueba.gs

Grid Analysis and Display System (GrADS) Version 1.8SL11
Copyright (c) 1988-2001 by Brian Doty
Center for Ocean-Land-Atmosphere Studies
Institute for Global Environment and Society
All Rights Reserved

Config: v1.8SL11 32-bit little-endian readline sdf/xdf netcdf lats
printim

Issue 'q config' command for more information.

GX Package Initialization: Size = 11 8.5
RUN error:  No file name specified