The bytes FF FE or FE FF in the beginning of file are often used to indicate whole file is UTF-16 with "byte order mark", not UTF-8. I don't know of any other p

The bytes FF FE or FE FF in the beginning of file are often used to indicate whole file is UTF-16 with "byte order mark", not UTF-8. I don't know of any other practical use, it's best to treat it as invalid.