You can start the ViewMol3D by simply typing in command line:
ViewMol3D[.exe] <FileName.(mol/out/gms/mop)> [white] [debug] [allbonds] [atomic] [smear] [stick]
where <FileName.(mol/out/gms/mop)> is name of file what you want to look.
and where parameters are
white - switches on presentation mode. It means that molecule model is represented on white background and more in detail. However this mode may be slower than normal mode
debug - switches on debug mode. In this mode ViewMol3D outputs some additional information
allbonds - ViewMol3D draws all bonds in molecule. Otherwise there are only bonds with order larger 0.5
atomic - switches on show atomic numbers on atoms. You can also shitch on this mode while ViewMol3D working by pressing key 'n'
smear - do not clear screen while rotate molecule
stick - switches on showing only bonds in the form of sticks. You can also shitch on this mode while ViewMol3D working by pressing keys '4' and '6'