Savegame

From OpenTTD

Savegame is a file with extension .sav containing previously played and saved singleplayer or multiplayer game. It can be loaded later to play in both singleplayer and multiplayer without any data loss.

OTTD is compatibile with most TTD, TTDPatch and previous versions of OTTD savegames, which will be converted to OTTD format. More details on interoperability.