D2X Picture Controls in Lightroom
I believe what you are asking about is D2X color modes, right? These were optional Picture Control profiles that you could download for the D3 and D300 to simulate the color profiles from the D2X. Lightroom continues to support these profiles. Below is the description copied from the Nikon announcement.
* When these optional Picture Controls are registered with the D300 digital-SLR camera, which supports the Picture Control System, color reproduction simulating that of the D2X and D2XS is possible;
* This is a set of three optional Picture Controls, one for each of the three D2X/D2XS Color mode settings;
* When the optional Picture Controls are registered with the D300 digital-SLR camera, color reproduction simulating that of images captured with the D2X and D2XS is possible, and custom Picture Controls can also be created based on these optional Picture Controls;
* For black-and-white images, use the standard Monochrome Nikon Picture Control;
* D2XMODE1: This optional Picture Control simulates color reproduction at a D2X/D2XS Color mode setting of I. Skin tones and gradations are reproduced naturally with rich reproduction of tones;
* D2XMODE2: This optional Picture Control simulates color reproduction at a D2X/D2XS Color mode setting of II. This optional Picture Control is suited to images that will be extensively processed or retouched;
* D2XMODE3: This optional Picture Control simulates color reproduction at a D2X/D2XS Color mode setting of III. Choose for nature or landscape shots. Greens and blues are vividly reproduced.
*To achieve a level of brightness similar to that of images captured with the D2X/D2XS, set Picture Control Brightness to -1.
Color reproduction precisely the same as that achieved with D2X/D2XS Color mode settings I, II, and III is not guaranteed with the three D2XMODE1, D2XMODE2, and D2XMODE3 optional Picture Controls.
*D2XMODE1-3 optional Picture Controls must be registered with the camera before custom Picture Controls, based on D2XMODE1-3, can be created using Capture NX or ViewNX and registered with the camera.