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# D.1 Version 5.x

Version 5.x.x of XTrackCAD introduced many enhancements an additions including Layout Control Objects, Cornu Tracks and Bezier Tracks and Lines. It is upward compatible from earlier versions but if the new objects are included in layouts, the files will not be readable by earlier versions.

Users should take a backup of thier Layout files if they will want to use the previous level of code before opening them.