Notes about the AO 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 AO file type is primarily associated with 'ActionOutline' by Green Parrots Software. ActionOutline helps you organize your bits of info into the intuitive Explorer-like outline form.