From the body:
<input name="dw_Abstract" type="file" required="required" id="dw_Abstract" tabindex="30" size="66" />
<span class="textfieldRequiredMsg">Please enter the file name for your abstract.</span>
<font size="-1">(Document type - plain text (txt) file only, please, up to 20kB.)</font>
$Doc_AbstractFile = GetSpryValue("dw_Abstract");
A few other details.
I'm getting these results using Firefox. When I use IE I get something like "C:/fakepath/filename.txt"
If interested, and you want to try it yourself, use this link: http://www.kstreetstudio.com/daviswrites/test/getwork.html Use the name "Meier" and ID "dw2012_002".
I finally had time to google "FlaePath" and found that browsers do not generally reveal the path on the client computer.