While not *EVERYTHING* is so intuitive as the following, the thing about filenames, is that they are defined in a file with a similar name: includes/filenames.php.
Now, that said, if you get squirrely and start developing your own software, you don't need to add your filenames to that file. There are other directories that can be used to load your self defined filenames. A reason you wouldn't want to modify that file is that when you do the next upgrade, you would have to make sure that those changes would carry over and the file would again need to be edited. If you keep your changes separate from the base/core files (as much as possible) then it becomes easier to just insert your files again in the future rather than modifying/merging.
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