Hi ddg4 or whoever ? > I have compiled VTK 4.2 in windows 98, and there is VTK application file > in VTK binarry folder. while executing VTK application file, Error > massage is coming 'TCL83.DLL' file not found. Can you please help. Ever tried google ? Download and install tcl/tk. http://www.activestate.com/Products/ActiveTcl/ greets Ingo