On Windows platforms we redistribute the Visual Studio runtime libraries with the JavaFX build so that JavaFX applications can run on systems that don't have them installed already. The main C++ runtime library is msvcp140.dll. Additional C++ functionality has been added to msvcp140_1.dll and msvcp140_2.dll neither of which are shipped.
Recently, WebKit has started using some functions that are only found in msvcp140_2.dll. We need to include these libraries as part of the JavaFX build along with msvcp140.dll (which is already included).