Notes about the VUI 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 VUI file type is primarily associated with 'Visual Navigation Suite' by Jeppesen Marine, Inc.. Visual Navigation Suite is navigation software. This is the extension used on newer versions. The older versions use the .UNS extension.