Fill Input File Type box on a web page

[iamlp]

I am trying to automate filling a form on the Web.
I have a file type input box and how can I put values on that Text box? I was able to put values into common text boxes other than type "File".
Anybody has any ideas???

Here is a sample htm file which has a file input box.

Test.htm
--------
<p align=left>Enter name of TEXT file:<input id="file1" name="txtFile" type="file" ></p>
</p>