How to open .NAV file extension?

If you cannot open a new file that has been saved in the .NAV format you need to download the appropriate software. The manufacturer of .NAV files is Valve; .NAV files belong to the Game Files category. After downloading the application from the list available on our website just run an unknown file, and as the default set the newly installed application supporting the .NAV files. Activities performed in the order described should solve the problems with all the files in the .NAV format.