AFAIR, builtin DLLs are only loaded from LD_LIBRARY_PATH (not any Win32 related stuff, like win32 system dir...) adding your dialogs dir to LD_LIBRARY_PATH should do (your shell would do I think) (look what tools/wrapper does ;-)
A+
in fact, it's not LD_LIBRARY_PATH but WINEDLLPATH which is used (LD_LIBRARY is only used for the pure .so libraries, not our builtint DLLs)
A+