You could use wxrc with the /c switch, this ouputs a c/c++ file which you can put in your project. This does not encrypt anything, but it hard-codes the resources into your program so that at least the average user will have problems editing them.
The resources are, of course, still plaintext in your executable, so someone able to use a hex editor won't have problems reading, but the dialogs appear "plaintext" on the screen, too, so there is no big secret, anyway.
