Drawing or design created with Technobox CAD, a German computer aided design (CAD) program; proprietary format used by Technobox CAD/4, CAD/5, and CAD/6; can be viewed with the free Tenado Viewer program.
Program(s) that open tcd files
Windows: Technobox CAD or Tenado Viewer
Information from FileInfo.com - The File Extensions Resource.
http://www.fileinfo.com/extension/tcd
