Notes about the OPN 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 OPN file type is primarily associated with 'Court Opinion File' by Tennessee Administrative Office of the Courts. Opinion files with the extension .OPN are either WordPerfect or Word files (depending on the year of issue).