These are links to an XML editor that I have found useful in examining .val and .vit files.
It is not a prettily packaged ready to use product, but if you are willing to build it from source I have and it runs on KUbuntu 18.04, built with Qt creator 4.5.2 using Qt 5.9.5. (If you don’t already understand what I just said about versions, this is not the tool for you yet.)
If you run windows, you are in luck if the version they distribute on sourceforge works as well as the one built from source.
All that said, here are the links.
Project site: http://qxmledit.org
Source code hosted at GitHub (moved from Google Code)
Report issues at:
Discussion group: http://groups.google.com/group/qxmledit-discuss