UCS-16/UTF-16 files

Here's a random question I'm running into in my quest to come up with a 
Pod::Simple encodings implementation that doesn't rub Encode's bugs the 
wrong way:
How common are UCS-16/UTF-16 files?  I've run into only a few ever, and 
they definitely were not Perl files.

I ask because UCS-16/UTF-16 (plus the rare-as-hen's teeth UCS-32 encoding) 
might not be easy to implement, so I'm thinking of just leaving them out 
for the moment.
--
Sean M. Burke    http://search.cpan.org/~sburke/