Ceea ce doresti se poate face cu ShellExecute.

Uite incarcarea unui fisier pdf sub VFP (fisierul este D112.pdf din folderul curent)

Declare Integer ShellExecute In shell32.Dll ;
    INTEGER hndWin, ;
    STRING cAction, ;
    STRING cFileName, ;
    STRING cParams, ;
    STRING cDir, ;
    INTEGER nShowWin
cFileName = "D112.pdf"
cAction = "open"
ShellExecute(0,cAction,cFileName,"","",1)

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