file system
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... character stream. This provides compatibility with file systems
or other software (e.g., the printf() function in C libraries)
that parse based on US-ASCII ...
... protocol elements such as MIME
entities, especially when implementations of the protocol will
obtain such entities from file systems, from protocols that do not
have encoding identification mechanisms for payloads ...
... X/Open Company Ltd., "X/Open Preliminary Specification -- File System Safe UCS Transformation Format (FSS-UTF)", May 1993, <http://wwwold.dkuug.dk/jtc1/sc22/wg20/docs/N193-FSS-UTF.pdf ...
