The XTTreeview control is found in the XTTreeviewVB.ocx file or the XTTreeviewVC.ocx file depending on the language of the component. XTTreeviewVB is the Visual Basic 6.0 file and XTTreeviewVC is the Visual C++ 6.0 (MFC) File. To use this control in your application, you must add the .OCX file to the project. When distributing your application, install the XTTreeviewVB.ocx/XTTreeviewVC.ocx file in the user's Microsoft Windows System or System32 directory and register the control (using regsvr32.exe or a similar tool). XML also requires you to install the following dlls in the end user's windows system32 directory: msxml4.dll (which must be registered using regsvr32.exe or a similar tool) and msxml4r.dll (Windows NT systems) or msxml4a.dll (Windows 9.x systems). XTTreeviewVB also requires the Visual Basic 6.0. SP5 runtime files (which can be found here).