# 1.9.1 Directories Overview

XTrackCAD uses two directories on your system:

- The XTrackCAD Install directory, which contains the data and parameter files used by XTrackCAD.

- The XTrackCAD Working directory, which contains configuration and Check Point files.

On MS Windows the Install directory is set when you install XTrackCAD. All data files (parameters, demos, examples) can be found in the `share/xtrkcad` subdirectory underneath the Install directory. The Working directory is in your personal profile.

On Linux the Install directory is usually `/usr/local/lib/xtrkcad/`, but you can change this by defining the `XTRKCADLIB` environment variable before starting XTrackCAD. The working directory is `{HOME}/.xtrkcad/`.

Layout files (`*.xtc`) and export (Section 2.5.1) files (`*.xti`) can be saved anywhere you wish, as specified in the Save File and Open File dialogs.

Example layouts can be found in the `example` directory under the XTrackCAD install directory.