Notes about the O2C 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 O2C file type is primarily associated with 'Objects to See 3D File Format' by mb Software AG. Highly compressed 3D file format that is optimized for Internet-based communication. A free player is available at the linked site.