This is a list of the problems I am able to anticipate. The VRML viewers behave very differently, so it is very hard to give general directions. Some viewers ignore errors and displays what they are able to make of the rest, while others display nothing, if a single comma is missing.
.wrl"-files, you probably need to get hold of a viewer like VRwave (Linux/ELF, SGI, Sun/Solaris, HPUX, DECAlpha), or CosmoPlayer (PC, Mac, SGI). Check your installation with VRML Browser Detector at NIST
.mailcap, and / or
.mime.types, Netscape (3x) will have to be notified, by selecting
Options->General Preferences, and then
x-world/x-vrml, and / or a corresponding helper-application or plug-in. You have to consult the installation instructions that came with the viewer.
.wrlfiles, you may need a gzip program for your machine. (Mac users should look at MacGzip)
gzip -dc filename | less.
NavigationInfonode containing the headlight state.