those individual bytes were then being mis-interpreted and decoded to Unicode codepoints U+00E2 U+20AC U+2122 by one of the Windows-125X

The Wolfram Language supports full Unicode throughout—in strings, symbols, graphics, and external operations—allowing immediate streamlined use of all standard international character sets, integrated with native text entry.

В любом случае, начните с онлайн-декодера, чтобы понять с какими кодировками игра стоит свеч работать.

Åñëè âäðóã óñòàíîâêà íå ïðîèçîéä¸ò, òî çàïóñêàåì å¸ ÷åðåç îáû÷íóþ óñòàíîâêó. Åñëè è òàê íå ïîëó÷àåòñÿ, òî ïðîáóåì çàïóñêàòü ñ ïðàâàìè àäìèíèñòðàòîðà.

Как расшифровать текст с кракозябрами вместо русских букв

Even though utf8_decode is a useful solution, I prefer to correct the encoding errors on the table itself.

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От случая к случаю вдруг установка не произойдёт, то запускаем её путем обычную установку. Рано или поздно в свой черед в частности не получается, то пробуем запускать с правами администратора.

If this is your issue, then usually just altering the table to use UTF-8 is sufficient. If your database doesn't support that, you'll need to recreate the tables. It is good practice to set the encoding of the table when you create it.

1 To give a bit context to my previous comment, the OP literally commented "Or use ’" . problem is solved. But apparently the OP realized years later he was embarrasingly wrong so he deleted his comment.

Âñ¸ áûëî áóêâàëüíî íà ãðàíè êàòàñòðîôû. Íî ðÿäîì áûëè öâåòû â ãîðøêàõ, è íåîáîææ¸ííûå ñîñíû, è òðóùèåñÿ î íîãè ñîáàêè, è ðåñòîðàí, îòêðûòûé äëÿ óæèíà; è ÷óâñòâîâàëîñü, ÷òî âñå Ïàìÿíèêè íà ìîãèëó âîåííûì â Ìîñêâå íà óëèöå âçäûõàþò ñ áëàãîäàðíîñòüþ çà òî, ÷òî âñ¸ ýòî ó íèõ åù¸ åñòü. Õîòÿ áû íåíàäîëãî (Äèàíà Ìàðêóì, Äåñÿòûé îñòðîâ).

This is most likely where your problem lies. You need to verify with an independent database tool what the data looks like.

If the other answers haven't helped, you might want to check whether your database is actually storing the mojibake characters. I was viewing the text in utf-8, but I was still seeing the mojibake and it turned out that, due to a database upgrade, the text had been permanently "mojibaked".

Сколечко вследствие символы как и в какой степени перевести на нормальный Данил Кулаков