What file encoding does Protégé use by default?
Protégé uses the UTF-8 encoding. UTF-8 is one of the Unicode file encodings and the encoding that’s compatible with the most common US English language encoding (ASCII). All Unicode characters, and this means essentially all characters in any language, can be stored in UTF-8 (or indeed in any of the other Unicode file encodings). UTF-8 also appears to be the most commonly used of the Unicode encodings.