Notes about the IOC file extension:
Incorrect file associations could be the result of underlying issues within your PC system. As such it is highly recommended to scan your PC for invalid registry entries, unused processes and other unfavourable system settings to identify slowdown issues.
The IOC file type is primarily associated with 'Winamp' by Nullsoft. According to the Winamp forums the file IMGORG.IOC has something to do with the Io plug-in for Winamp. To uninstall, the instructions say to press Control-P while in Winamp, choose General Purpose Plug-ins, choose uninstall. The plugin itself should be: C:\Program Files\Winamp\Plugins\gen_io.dll