I recommend :raw:encoding(...), but keep in mind it has the side effect of not adding/removing a CR that preceeds a LF.

Maybe it's worth mentioning (though it has nothing to do with the OP's problem) that - in some cases - you can work around this CR/LF issue by re-adding the Windows specific crlf PerlIO layer (which is being removed by :raw) in a different position in the layer stack, e.g. 

:raw:encoding(utf16le):crlf:utf8"

[download]

as I described in more detail in this node.

In reply to Re^2: Converting UTF-16 files to UTF-8 by almut
in thread Converting UTF-16 files to UTF-8 by demerphq

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