Notes about the AOI 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 AOI file type is primarily associated with 'Art of Illusion' by Peter Eastman. Art of Illusion is a free, open source 3D modelling and rendering studio.