I agree, but what do you need to write in order to change the dlls for a built-in application ? A question was already asked on the list, but no valuable answer was found. The builtin application chosen was wcmd.
wcmd.exe should work. in fact, this should be inserted in the wine config file which will populate dynamically the registry (writting directly to the registry files won't work.
for example, add this to ~/.wine/config to run shell32/shell as native by default
[AppDefaults\wcmd.exe\DllOverrides] "shell32"="n,b" "shell"="n,b"
(see documentation/samples/config for more details and examples)
A+