I do not know what is this Get function of FSO. But you can use CommonDialog ActiveX control. Put this control on the form (it is invisible at run-time) and one command button. In the Click event of button write:

Me.CommonDialog0.ShowOpen

When you click this button, the OpenFile standart Windows dialog will be shown.

The CommonDialog control has possibility to set file masks, as in VFP function GetFile() and also to show dialogs for selecting font, color and SaveAs file dialog. See MSDN for more information about this control.