Open the .trk file with NOTEPAD,
change
Instance=obj_335
{
MeshFile=obj_335.gmt CollTarget=False HATTarget=False ShadowReceiver=False ShadowCaster=(Static, Solid, 32, 32)
}
Instance=obj_336
{
MeshFile=obj_336.gmt CollTarget=False HATTarget=False ShadowReceiver=False ShadowCaster=(Static, Solid, 32, 32)
}
to
Instance=obj_335
{
MeshFile=obj_335.gmt CollTarget=True HATTarget=False ShadowReceiver=False ShadowCaster=(Static, Solid, 32, 32)
}
Instance=obj_336
{
MeshFile=obj_336.gmt CollTarget=True HATTarget=False ShadowReceiver=False ShadowCaster=(Static, Solid, 32, 32)
}