With most Delphi and C++ Builder projects, including component packages, you can add a 64-bit Windows target by right-clicking on the Target Platforms item in the Project Manager and selecting Add Platform, then choosing '64-bit Windows' in the resulting dialog.
Recently while installing components in a new installation of RAD Studio XE4, I've been unable to do this for some components. For example:
This specific example is TMS's Advanced Poly List, but it's happened for other component packages as well - but not all. Some have the target available, and for those I can build the package and create a 64-bit VCL forms application that uses the component fine.
What is preventing the Win64 target appearing in the dialog, and how can I re-enable it?