The classiccolors.zip file you have requested: Mods / Graphical Tweaks / Classic Colors Skin Pack - 6.78mb is not available. Perhaps try browsing all files for the game Doom III and upload any files you want to share or are missing. This is the only information we could locate:
This mod changes some of the Doom 3 monsters' colors back to their original Doom 1 and 2 counterparts. The Imp, Pinky, Lost Soul, Cacodemon, Mancubus, Arch Vile, and Hell Knight are changed.