In article <op.uotab6oa9245dp / kool>,
  "Michael Selig" <michael.selig / fs.com.au> writes:

> That's right - These files are quite small, and I only need to do  
> sequential I/O. I want to keep the format backward compatible when using a  
> single-byte encoding.

Whould you show an example of such format?

I couldn't imagine a fixed length field which single byte
encoding (US-ASCII) is usable and multibyte encoding is
useful.

For example, zip code or some fixed numbering system is
fixed length but multibyte encoding is not useful.
-- 
Tanaka Akira