Frank,
Resources management is a standard Windows feature: you can store your GUI dialogs and GDI objects (bitmaps, cursors, icons, etc.) inside RC files (ascii files) and those resources get embedded inside your EXE (or DLL) and you can instantiate those objects from your application at runtime, and once instantiated, you can modify them, etc.
From Visual Basic on, Microsoft and other companies started to use non standard ways of storing resources, thus breaking the overall compatibility that the original RC files provided. There was a standard model for all applications. Now this no longer applies.
With FiveWin we decided, since early versions, to keep using the standard Windows resources, as that lets us use lots of different resources editors, tools, etc. that are based on the original and standard Windows resources.
In example: you can not use a Visual Basic form from a C++ application, neither from other development environments. But you can use a standard RC file with C++, FiveWin, etc. Its a standard