The Navigation is set to the WALK viewer!

Here are the official Fields and Events, for the NavigationInfo node in the VRML text, according to the VRML2 Spec:
 NavigationInfo {
  eventIn      SFBool   set_bind
  exposedField MFFloat  avatarSize       [ 0.25, 1.6, 0.75 ]
  exposedField SFBool   headlight        TRUE
  exposedField SFFloat  speed            1.0 
  exposedField MFString type             "WALK" 
  exposedField SFFloat  visibilityLimit  0.0 
  eventOut     SFBool   isBound

------->>> the source for the .wrl file!