location.href=“tencent://message/?uin=客服QQ号”;

修改之后的代码变成这样：

Dim txt As String
If  Tables("客户").Current IsNot Nothing Then
     txt = Tables("客户").Current("QQ号码") 
    Dim str As String   

    If txt > ""
    str = "<script Type=""text/javascript"">location.href=""tencent://message/?uin=" & txt & """</script>"
    FileSys.WriteAllText("D:\data\Table.html",str, False) '将信息写入网页文件里面,保存到D盘下面.
    Dim Proc As New Process  '启动浏览器打开这个网页文件,运行
    Proc.File = "D:\data\Table.html"
    Proc.Start
    'Sleep (2000)
    Proc.WaitForExit '等打开程序之后退出
    Else
    MessageBox.show("QQ号为空,无法联系")
    End If
End If