RFC 3629:UTF-8, a transformation format of ISO 106...
RFC-Ref

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 ...



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