An old add0-on program for Autocad has not been supported since the release of Autocad 2006. The company that produced Icontool has made the source code available for download here. http://wiki.mcneel.com/icontool/source The program needs to be recompiled so that it will work with the current version of Autocad. This is all I know about what would be needed to do this. Visual Studio .NET 2002 is needed to compile it. The ARX libraries are dependent on the MFC 7.0 libraries bundled with VS2002.