As of 3 August 2024, OpenRCT2 needs some files from RCT2 in order to run. You can simply install RCT2 and link OpenRCT2, but if you want to optimise your installation, you can use the information on this page to see which files OpenRCT2 needs specifically.

• Data:
  • Required: g1.dat
  • Optional: CSS1.DAT and CSS2.DAT (sound effects)
  • Optional: CSS3.DAT - CSS9.DAT, CSS11.DAT - CSS15.DAT and CSS18.DAT - CSS46.DAT (music styles)
  • Optional: CSS17.DAT (title screen music)
• ObjData:
  • Required: The 772 default RCT2 objects. Easy to identify by sorting on date, since all 772 have a similar timestamp (usually from 2002 or 2003).
  • Optional: The ObjData from Wacky Worlds and Time Twister.
• Scenarios:
  • Required: If you use the OpenRCT2 title sequence, no scenarios are needed. Six Flags Magic Mountain.SC6 is needed for the RCT2 title sequence.
  • Optional: The standard scenarios from RCT2.
• Tracks:
  • Required: None.
  • Optional: The entire Tracks folder (with the *.TD6 files), which will enable you to select prebuilt rides if you don't want to create them all manually.

Note: RCT1 is not required to run OpenRCT2. However, it is strongly recommended if you want to open parks or scenarios that contain RCT1 content.

• Data:
  • Required: csg1i.dat and csg1.dat (sometimes named csg1.1).
  • Optional: mp.dat, which contains the “Mega Park” scenario in encoded form.
• Scenarios:
  • Required: None.
  • Optional: All scenarios in this folder.
• Tracks:
  • Required: None.
  • Optional: All files with the *.TD4 extension that don’t begin with u(.
  • Optional: All files with the *.TD4 extension that do begin with u(. These are user-created track designs of varying quality.