For some older technologies like VB6.0, Delphi, or MFC based applications, Ranorex Studio has limited support for robustly identifying UI elements. However, the GDI RawText plugin increases object recognition for controls that use the Windows GDI drawing mechanism to display text on screen.
Reference
Using the GDI plugin for certain controls or classes is explained in Ranorex Studio advanced > Ranorex Spy > GDI capture feature