Siger Studio has released a free plugin for Max that can be used to render materials with a complex index of refraction (IOR), such as metals. The Texmap plugin can be used as a reflection color map in a material with the Fresnel option of the material turned off (the plugin does its own Fresnel calculations). The plugin is based on an original shader by Vladimir Koylazov. More on Siger Studio’s website.
Free Complex Fresnel Texmap plugin
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There is also another plugin for free: http://www.sigerstudio.eu/shop/3ds-max/sigertexmap-thinfilm/