/usr/share/games/etr/fonts/fonts.lst is in extremetuxracer-data 0.7.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | # list of fonts
*[name] normal [file] std.ttf
*[name] italic [file] stditalic.ttf
*[name] bold [file] stdbold.ttf
*[name] outline [file] outline.ttf
*[name] pc20 [file] pc_20.ttf
*[name] pcoutline [file] pc_outline.ttf
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