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### 4.5.2 Configuration File

Many applications have an accompanying configuration file which describes configuration options specific to that application. Similarly, plug-in modules can have configuration files. Configuration files are named with the file extension ``.cfg'` and are typically located within the VFS virtual directory ``/config/'` (see section Virtual File System (VFS)) which is often mounted at the physical location ``CS/data/config'` for Crystal Space sample applications.

The format of these files is simple. They consist of a number of keys, each of which consists of a name, a value and an optional comment. Key names contain dots to create a pseudo-hierarchy, similar to a file system; for example: ``Video.OpenGL.EnableDither'`. This should be interpreted as the ``EnableDither'` option in the sub-section ``OpenGL.'`, which resides in section ``Video.'` (note that the dots are part of the key name).

The file itself looks something like this:

    ; This is the comment for the first batch of keys.
    Section.Keyname = Value
    ; Comments may be
    ; several lines long
    ; The option 'Section.TestOption' (below) has no attached comment.
    Video.OpenGL.EnableDither = true
    Section.TestOption = false
    ; Comments at the end of the file do not belong to any configuration
    ; key. When a config file is loaded and saved again later this
    ; end-of-file comment is retained at the end of the file.

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