文件流打开后格式变化

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使用以下代码打开excel，然后使用SaveExcel保存（不加参数），格式变化了，附件是excel，附件是zip，解压后得到excel
         Dim s As System.IO.FileStream
         Try
            s = New System.IO.FileStream(file_path, IO.FileMode.Open, IO.FileAccess.ReadWrite)
         Catch ex As Exception
            MsgBox(ex.Message)
            Exit Sub
         End Try
         Dim wl As New FarPoint.Excel.ExcelWarningList
         Try
            frmcommon_inst.FpSpread1.OpenExcel(s, wl)
         Catch ex As Exception
            MessageBox.Show(ex.Message)
         End Try