If a specularmap image file is specified in a CMOD model, that image is ignored by v1.6.2 (and by v1.6.1). It works in v1.7.0. It'd be nice if the fix could be backported to v1.6.2.
This Addon provides an ASCII CMOD model (models/planet.cmod) and surface texture images in textures/medres (planet.jpg and planet-spec.jpg) which demonstrate this bug.
The CEL://URL below takes you to a viewpoint which demonstrates this bug: The entire surface of the front facet of the "planet" is incorrectly drawn as bright white when viewed in v1.6.2, but when viewed in v1.7.0, the "land" areas are correctly not reflective.
Also, see the accompanying framegrabs cmod-spec-bug_1.6.2.png and cmod-spec-bug_1.7.0.png which show these results.