Writing bold text with UTL_FILE package

Could anyone please share how to write开发者_运维知识库 bold text to a .dat file using something similar to the below or otherwise in PL/SQL?

UTL_FILE.PUT_LINE(FPOINTER,'i want this in bold');

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I think I maybe wrong but you can't do text with styles with UTL_FILE. .dat usually is used for information only, and its representation (like bold texts) is not part of it.

However you can save file as HTML and put lines like '<b>'|| 'my text here' || '</b>'