Customize menu > Configure User Paths > Configure User Paths dialog > External Files panel
On the External Files panel of the Configure Paths dialog, you can add or modify path directories for bitmaps, catalogs and tools stored in the Content Browser, and downloads; that is, files transferred from the Internet via i-drop. Bitmaps are used for background images and mapped materials (textures, bump maps, displacement maps, and so on). The Content Browser is a central storage area for project-based files in the form of catalogs and tool palettes. Photometric files are used to define various characteristics of Photometric lights.
Note: By default the paths for \Maps\fx, \Maps, and the root folder are all relative to the root directory of Autodesk VIZ whereas the \downloads folder is relative to the project folder by default.
Autodesk VIZ stores the path of any file you load. When the file is reloaded, the search order is as follows:
The paths listed in the External Files panel, starting at the top of the list.
Note: To save loading time, if a map with the same name is in two different locations (paths), it is loaded only once. This poses a problem only if your scene includes two different maps with the same name. In this case, only the first map encountered will appear in the scene.
Every subdirectory under the directory of the current scene.

For descriptions of the general dialog controls, see Configure User Paths.