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# OpenTTD directory structure
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OpenTTD uses its own directory to store its required 3rd party base set files
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(see section 4.1 'Required 3rd party files') and non-compulsory extension and
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configuration files.
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See below for their proper place within this OpenTTD main data directory.
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The main OpenTTD directories can be found in various locations, depending on
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your operating system:
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1. The current working directory (from where you started OpenTTD)
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For non-Windows operating systems OpenTTD will not scan for files in this
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directory if it is your personal directory, i.e. '~/', or when it is the
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root directory, i.e. '/'.
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2. Your personal directory
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- Windows:
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- `C:\My Documents\OpenTTD` (95, 98, ME)
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- `C:\Documents and Settings\<username>\My Documents\OpenTTD` (2000, XP)
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- `C:\Users\<username>\Documents\OpenTTD` (7, 8.1, 10, 11)
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- macOS: `~/Documents/OpenTTD`
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- Linux: `$XDG_DATA_HOME/openttd` which is usually `~/.local/share/openttd`
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when built with XDG base directory support, otherwise `~/.openttd`
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3. The shared directory
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- Windows:
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- `C:\Documents and Settings\All Users\Shared Documents\OpenTTD` (2000, XP)
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- `C:\Users\Public\Documents\OpenTTD` (7, 8.1, 10, 11)
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- macOS: `/Library/Application Support/OpenTTD`
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- Linux: not available
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4. The binary directory (where the OpenTTD executable is)
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- Windows: `C:\Program Files\OpenTTD`
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- Linux: `/usr/games`
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5. The installation directory (Linux only)
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- Linux: `/usr/share/games/openttd`
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6. The application bundle (macOS only)
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It includes the OpenTTD files (grf+lng) and it will work as long as they
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are not touched
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Different types of data or extensions go into different subdirectories of the
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chosen main OpenTTD directory:
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| data type | directory | additional info |
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| ------------------- | ----------------- | --------------------------- |
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| Config File | (no subdirectory) | |
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| Screenshots | screenshot | |
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| Base Graphics | baseset | (or a subdirectory thereof) |
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| Sound Sets | baseset | (or a subdirectory thereof) |
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| NewGRFs | newgrf | (or a subdirectory thereof) |
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| 32bpp Sets | newgrf | (or a subdirectory thereof) |
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| Music Sets | baseset | (or a subdirectory thereof) |
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| AIs | ai | (or a subdirectory thereof) |
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| AI Libraries | ai/library | (or a subdirectory thereof) |
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| Game Scripts (GS) | game | (or a subdirectory thereof) |
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| GS Libraries | game/library | (or a subdirectory thereof) |
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| Savegames | save | |
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| Automatic Savegames | save/autosave | |
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| Scenarios | scenario | |
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The (automatically created) directory content_download is for OpenTTD's internal
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use and no files should be added to it or its subdirectories manually.
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## Notes:
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- Linux in the previous list means .deb, but most paths should be similar for
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others.
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- The previous search order is also used for NewGRFs and openttd.cfg.
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- If openttd.cfg is not found, then it will be created using the 2, 4, 1, 3,
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5 order. When built with XDG base directory support, openttd.cfg will be
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created in $XDG_CONFIG_HOME/openttd which is usually ~/.config/openttd.
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- Savegames will be relative to the config file only if there is no save/
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directory in paths with higher priority than the config file path, but
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autosaves and screenshots will always be relative to the config file.
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Unless the configuration file is in $XDG_CONFIG_HOME/openttd, then all
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other files will be saved under $XDG_DATA_HOME/openttd.
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## The preferred setup:
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Place 3rd party files in shared directory (or in personal directory if you do
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not have write access on shared directory) and have your openttd.cfg config
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file in personal directory (where the game will then also place savegames and
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screenshots).
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## Portable installations (portable media)
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You can install OpenTTD on external media so you can take it with you, i.e.
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using a USB key, or a USB HDD, etc.
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Create a directory where you shall store the game in (i.e. OpenTTD/).
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Copy the binary (OpenTTD.exe, OpenTTD.app, openttd, etc), baseset/ and your
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openttd.cfg to this directory.
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You can copy binaries for any operating system into this directory, which will
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allow you to play the game on nearly any computer you can attach the external
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media to.
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As always - additional grf files are stored in the newgrf/ dir (for details,
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again, see section 4.1).
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## Files in tar (archives)
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OpenTTD can read files that are in an uncompressed tar (archive), which
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makes it easy to bundle files belonging to the same script, NewGRF or base
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set. Music sets are the only exception as they cannot be stored in a tar
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file due to being played by external applications.
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OpenTTD sees each tar archive as the 'root' of its search path. This means that
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having a file with the same path in two different tar files means that one
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cannot be opened, after all only one file will be found first. As such it is
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advisable to put an uniquely named folder in the root of the tar and put all the
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content in that folder. For example, all downloaded content has a path that
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concatenates the name of the content and the version, which makes the path
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unique. For custom tar files it is advised to do this as well.
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The normal files are also referred to by their relative path from the search
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directory, this means that also normal files could hide files in a tar as
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long as the relative path from the search path of the normal file is the
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same as the path in the tar file. Again it is advised to have an unique path
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to the normal file so they do not collide with the files from other tar
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files.
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## Configuration file
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The configuration file for OpenTTD (openttd.cfg) is in a simple Windows-like
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.INI format. It is mostly undocumented. Almost all settings can be changed
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ingame by using the 'Advanced Settings' window.
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When you cannot find openttd.cfg you should look in the directories as
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described in this document. If you do not have an openttd.cfg OpenTTD will
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create one after closing.
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