There is only one file type that uses the .TD6 extension:
RollerCoaster Tycoon Track Design File
Game file used by RollerCoaster Tycoon 2, an amusement park management game; contains a track design and is used for building roller coasters in the game's theme parks; includes information such as the track parts, number of cars per train, and colors.
|Chris Sawyer RollerCoaster Tycoon 2||Paid|
Updated: June 26, 2014