File with an OVL extension contains different types of data stored in form of a container – 3D models, graphic and textures, music and sounds of a game, and also information on a user specific arrangement.

OVL files are used in the Rollercoaster Tycoon 3 game, they constitute the data archive of the game. This popular game which enables creating and managing an amusement park with roller-coasters was published in the year 2004 an it available on different platforms.