IE11 doesn't see fonts no matter what I do - how do I make it recognize them?

Question

css

So it goes.

@font-face {
    font-family: 'Museo Sans';
    src: url('../fonts/MuseoSansCyrl_500.eot');
    src: local('☺'),
         url('../fonts/MuseoSansCyrl_500.eot?#iefix') format('embedded-opentype'),
         url('../fonts/MuseoSansCyrl_500.otf');
    font-weight: normal;
    font-style: normal;
  }

Here's a crutch I use, but IE11 still refuses to read this font. At least kill yourself.
What else can be done?
I've never struggled so much with fonts for IE before.
In the console it gives some kind of game:
@font-face encountered unknow error

Answer 1

IE11 perfectly understands the woff format, which is twice as light as eot. Why are you feeding him eot.
In general, it is high time to adopt this service https://www.fontsquirrel.com/tools/webfont-generator