http://bugs.winehq.org/show_bug.cgi?id=36775
--- Comment #10 from Gethyn ThomasQuail xylem2020@gmail.com --- Well I already have libpng installed on my Distro (Fedora 20) but since I'm on a 64-bit machine I decided to try a 64-bit Wine prefix, despite that I constantly see that libpng error with Wine all the time (for example, creating icons for Desktop files). I can't install .NET 4 under Wine 64-bit because it tells me that I have .NET already installed. Because this, I can't even get the launcher to work because of its need for .NET 4. So I honestly don't know what to do at this point besides completely uninstalling Wine, restarting, and then reinstalling Wine because this has supposedly fixed libpng errors for others. After that, I guess I will try ROTT once again.