Two different things have happened recently - user_none added auto-detection for text file encoding, prior to that you always had to manually specify the non-ascii encoding. I think there are some limitations with the detection though, it's not expected to catch all cases, so you may be in the margins.
RTF is a slightly different story, it hasn't historically supported any non-ascii. However a bunch of work was done on RTF in the last few months - I believe by Sengian - and I believe non-ascii is generally supported but I'm not sure if all the wrinkles have been ironed out.
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