A vnu file extension is related to the CoffeeCup Visual Site Designer. A vnu file stores project.
Software that open vnu file
VNU file extension - CoffeeCup Visual Site Designer project
What is vnu file? How to open vnu files?
File type specification:
The vnu file extension is associated with the CoffeeCup Visual Site Designer, a web designing tool for Microsoft Windows and macOS (OS X) operating systems.
The vnu file contains saved web design project.
The default software associated to open vnu file:
CoffeeCup Visual Site Designer 
Company or developer:
CoffeeCup Software, Inc.
Visual Site Designer is a fully-featured WYSIWYG HTML editor.
List of software applications associated to the .vnu file extension
Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open vnu file, edit vnu file, convert vnu file, view vnu file, play vnu file etc. (if exist software for corresponding action in File-Extensions.org's database).
Hint:
Click on the tab below to simply browse between the application actions, to quickly get a list of recommended software, which is able to perform the specified software action, such as opening, editing or converting vnu files.
Software that open vnu file - CoffeeCup Visual Site Designer project
Programs supporting the exension vnu on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about CoffeeCup Visual Site Designer for open vnu file action.
