自己编写代码导出数据，确定sheet的最后一个位置即可。

http://www.foxtable.com/help/topics/1148.htm

能在窗口1给个具体代码吗?

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点击浏览该文件:导出到excel.zip

Dim dt As Table = Tables("订单")
Dim Book As New XLS.Book(ProjectPath & "Book1.xls") \'定义一个Excel工作簿
Dim Sheet As XLS.Sheet = Book.Sheets("sheet1") \'引用工作簿的第一个工作表
Dim count As Integer = sheet.Rows.Count
If count = 0 Then \'本来就没有数据,导出表头
    For c As Integer = 0 To dt.Cols.Count -1 \'添加列标题
        Sheet(0, c).Value = dt.Cols(c).Name
    Next
    count += 1
End If
For r As Integer = 0 To dt.Rows.Count - 1 \'填入数据
    For c As Integer = 0 To dt.Cols.Count -1
        Sheet(r + count, c).Value = dt.rows(r)(c)
    Next
Next
\'打开工作簿
Book.Save(ProjectPath & "Book1.xls")
Dim Proc As New Process
Proc.File = ProjectPath & "Book1.xls"
Proc.Start()

Dim dt As Table = Tables("订单")
Dim Book As New XLS.Book(ProjectPath & "Book1.xls") \'定义一个Excel工作簿
Dim Sheet As XLS.Sheet = Book.Sheets("sheet1") \'引用工作簿的第一个工作表
Dim count As Integer = sheet.Rows.Count
For r As Integer = 0 To count \'填入数据
    If dt.FindRow("_Identify = " & val(sheet(r,0).value)) >= 0 Then
        msgbox("重复操作")
        count = -1
        Exit For
    End If
Next
If count <> -1 Then
    If count = 0 Then \'本来就没有数据,导出表头
        Sheet(0, 0).Value = "_Identify"
        For c As Integer = 0 To dt.Cols.Count -1 \'添加列标题
            Sheet(0, c+1).Value = dt.Cols(c).Name
        Next
        count += 1
    End If
    For r As Integer = 0 To dt.Rows.Count - 1 \'填入数据
        Sheet(r + count, 0).Value = dt.rows(r)("_Identify")
        For c As Integer = 0 To dt.Cols.Count -1
            Sheet(r + count, c+1).Value = dt.rows(r)(c)
        Next
    Next
    \'打开工作簿
    Book.Save(ProjectPath & "Book1.xls")
    Dim Proc As New Process
    Proc.File = ProjectPath & "Book1.xls"
    Proc.Start()
End If