So you want this section allow the user to be able to open the file? I found that this here works quite nicely. Using the target to open a new window gives the user the ability to still return to the upload section of your server, without the use of the back button.
As you can see it goes into this section

[upload-success]
<li><b>SUCCESS!</b> Uploaded: <a href="%item-name%" target=_blank>%item-name%</a> --- %item-size% (Speed: %speed% KB/s)