Track Horizon window
Here you can see the horizon that the game renders for the track. You can load a horizon (e.g. from another track file) or save it to disk.
The 1x view is a pixel-per-pixel representation, whilst the 8x is magnified so that it’s easier to see on modern screens.
The “Load Horizon” button lets you load a horizon from any type of file.
The “Save Horizon” button lets you save the current horizon to disk as a .arghoriz file.