[horde] is horde/config/registry.d generic?

[A. Schulze]

Hello,

I may change the horde registry by placing stuff in
1. ~horde/config/registry.local.php
2. ~horde/config/registry-servername.php
3. ~horde/config/registry.d/foobar.php

the first and second version work also for other configuration files.
-> conf.local.php, prefs.local.php, nls.local.php ...

Does horde general also look in subdirs conf.d/, prefs.d, backends.d  
or similiar?
Does imp, kronolith, ansel, ... behave the same way?
I'm unsure because only ~horde/config/registry.d exist after installation.

Thanks for clarification,
Andreas