file形式的input框设置初始值的办法

能否在

1<input name="filename" type="file"/>

框中添加初始值?
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file形式的input框原则上是不允许输入初始值的,所以要加初始值即使能做到也不是很理想的.

1<script>   
2function window.onload(){   
3ss.focus();   
4var WshShell=new ActiveXObject("WScript.Shell")   
5WshShell.sendKeys("C:\\\test.txt")   
6}   
7</script>
1<input id="ss" name="ss" type="file"/>
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