There are several methods... You have already been shown how to use the ShellExecute function of the Windows API.

However, if you need to interact with Excel, you will want to use automation:

oExcel = Createobject("excel.application")
oworkbook = oExcel.workbooks.add(Getfile()) && point to an xls file....
oExcel.visible = .t.


>I want to click a buttom to lunch Excel with a excel document which a get from getfile().