Notes about the NV3 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 NV3 file type is primarily associated with 'Visicontrol MVS-30/35/40 Flash-Memory Backup File'. (Ver 3.0+)