hmmm, I don't have / see an icon named workicon.ico in my DBProEX9 folder(s). I installed DBProEX9 under my root drive C:\ and not program files. All I did was install my retail versions of all plugins I bought under that folder and then copied the certificates folder with all the plugin certificates to the compiler folder. Then made sure I pointed the Synergy Editor to the current compiler (use the most recent version of Synergy Editor). Also, for any icons I use for each project I just remove the full path and retain only the relative path e.g. media\myproject.ico. I'll have another look and see what else it could be.
[update-try the attached Synergy Editor EXE just in case you can't find the last recent editor]