@@Installation.htm Virtual Treeview is designed for Delphi 7 and higher and can also be used with Borland C++ Builder 2006 and up. It is however not designed to work directly with Kylix, Lazarus, Free Pascal or Delphi for .NET. The initial core source files are: <image Document><b>Compilers.inc</b> Include file which contains various compiler switches which determine the target compiler and the target operating system. <image Document><b>VTConfig.inc</b> Include file which contains version neutral compiler switches which control certain things that can be compiled into the tree view (e.g. Windows XP theme support, Unicode controls, a specialized node memory manager etc.). <image Document><b>VirtualTrees.pas</b> The actual implementation of Virtual Treeview and its descendants and support classes. <image Document><b>VirtualTrees.res</b> Resource file containing some check and miscellaneous images used for all Virtual Treeviews. <image Document><b>VTHeaderPopup.pas</b> Unit containing a TPopupMenu descendant which provides a convenient way to implement a header popup used to switch visibility of columns. * Installation * Please have a look at the file INSTALL.txt for installation instructions. the installer which was formerly available is no longer maintained.