TEREP (literally Terrain, also known as Deformers) is a driving simulation by Dénes Nagymáthé.
I unpacked the executables to aid in editing and reversing. The original executable is included, the unpacked one ends with U.EXE. Hopefully they still work!

Download Terep2
Download Terep1 (earlier version)
TEREP2 will read in these files (in order):
sim.cfg
map.pcx
maptex.pcx
col.pcx
fog.dat
smoke.dat
textures.pcx
car1.dat
car1.pcx
car2.dat
car2.pcx
car3.dat
car3.pcx
car4.dat
car4.pcx
car5.dat
car5.pcx
The game will load any "car?.dat" file that exists. If the corresponding ".pcx" file does not exist, it will default to using "textures.pcx".
NOTE: Due to a bug, the game will crash if all 5 cars use a custom texture. There has to be at least one car using the default "textures.pcx" texture to prevent this crash.
The original seemed to only have 2 cars defined, with the rest included in the CARS directory. Copy them into the main directory if you want them available in game.
The car's breaking properties can be modified by creating and adjusting the "sim.cfg" file. It consists of two 16-bit words. The defaults are 0x0800 and 0xF000. There are some community created config files that can be used, just rename a ".cfg" file to "sim.cfg". Modifying these values can make the game unstable during heavy collisions.
Know of any links that aren't listed here? Let me know!
There's a collection of archived and incomplete fan sites here: