Eudora don't has user-defined MIME charset, it force iso-8859-1 for all messages with 8 bit chars. You can bug Eudora author Jeff Beckley to add user-defined 8bit MIME charset to future Eudora versions instead of all this cracks.
Here two binary patches which change iso-8859-1 to koi8-r directly into .EXE file:
Don't forget to turn off Quoted-Printable option from Eudora setup.
See also Win95 Eudora Fix.
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