# 1.8.1 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 and Working directories are set when you install XTrackCAD.

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.