without entering a text for "Text to Replace", it gives an error-message "Text to Replace: Please enter valid smilie text."
So I am unsure about the "valid smilie text" .... ?
I just went through the smiley-png.files on my server (XF 1.0.4 default install), there is for example a smiley named "Alien" at "styles/default/xenforo/smilies/alien.png"
This one is not listed on the XF-smiley-list posted by Kier? What would be the "valid text" for that one for example?