You can use QuickCase:W to modify the interface of an existing Windows program, but it can be an involved process.
QuickCase:W requires a Windows database (.WIN) file before it can generate any source files. Therefore, to modify an existing program you must:
1.Draw the application's new interface in QuickCase:W (which creates a .WIN file)
2.Generate new source files for the application.
3.Copy and paste the event-handling code from the original program into the new .C file.
Any future changes to the interface can be easily accommodated since QuickCase:W now has a database (.WIN) file for the program.
If the program's original C code is modular, the copy-and-paste process can be simple. However, if the original program mixes both functionality and interface calls together, the process may be more difficult.