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# Configuring the LATEX format

There are four configuration files that enable personal preferences to be incorporated into the LATEX format file `latex.fmt`. The range of preferences that can be configured by these files is strictly limited as this helps to ensure document portability.

All four files work in the same way: if the file <file>`.cfg` is found, it will be input by iniTEX; otherwise a default file <file>`.ltx` will be input; this is sometimes done via a minimal <file>`.cfg` that simply inputs <file>`.ltx`. Thus, providing your own version of any of these `.cfg` files can completely override any settings in the corresponding default standard `.ltx` file.

- Font configuration
- fonttext.cfg
- fontmath.cfg
- preload.cfg
- Hyphenation configuration
- hyphen.cfg