Unicode is not a file format.
Unicode is rather abstract concept: a collection of characters, and a mapping from the characters to numbers.
But to write a file, there is one step missing: a character encoding, that transforms those numbers into bytes. Popular ones are UTF-8, and UTF-16LE, UTF-16BE and UTF-32.
Some programs on windows write "Unicode" when they mean one of the UTF-16 encodings, but it's still wrong.
So, what encoding do you want?
Also please read Encodings and Unicode.
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