How to change encoding in *.rtf file?

Question

Character encoding

There is a *.rtf file, I open it in php as a string, I replace it with str_replace(); there are some values, after that the encoding of Russian letters is broken. The problem is that the file itself is in win 1251, and the values ​​\u200b\u200bthat I change to UTF-8. I tried to encode in notepad++ in UTF-8, but it didn't work. How to change/set encoding in rtf file? I found the line there:
{\rtf1\adeflang1025\ansi\ansicpg1251\uc1\adeff0\deff0\stshfdbch0\stshfloch1\stshfhich1\stshfbi1\deflang10
ansicpg1251 - this is the encoding, as I understand it, can I somehow change it to UTF-8?

Answer 1

if the file is in win 1251, then you need to write to it in win 1251.
iconv to help.