To make files available via a Challenger server there are a few different types of modules which cooperate.

The source of all files are one or more Location modules. They provide files as well as directory information. Location modules can be mounted on overlapping mount points, in which case the union of the files provided by the modules will become available.

A Directory module is used to handle index files, such as index.html, or produce directory listings.

File extension modules handle files of a certain extension. The Main RXML parser module is a file extension module that usually handles .html or .rxml files.

If no File extension module handles a certain extension the Content types module will be called to determine the appropriate content-type for a file.