The file "NewtonImport.pas" contains the current translation of the header for the Newton Game Dynamics Physics SDK (http://www.newtongamedynamics.com) and should work with Delphi and Free Pascal. Other Pascal languages might work but were not tested (except for VP, which was tested, but VP is discontinued). "NewtonImport_JointLibrary" contains the current translation of the joint library with different tpyes of joints. It was initially done by Exectutor and needs the dll "JointLibrary.dll" from the Newton SDK.