There is only one file type that uses the .TCW extension:
TurboCAD Drawing File
Proprietary 2D/3D vector graphics format used by TurboCAD, a professional 2D and 3D design program; may contain a 2D layout, a single 3D model, or an entire 3D scene.
The TCW file is only supported by the Windows version of TurboCAD and not the OS X version. To open it in the OS X version, you can export the drawing to the .DXF or .DWG format and import it into the OS X version of TurboCAD.
NOTE: TCW is also an abbreviation for "TurboCAD for Windows."
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Updated: January 23, 2015