How to use it? 2 Rated 3 out of 5 stars

I selected some "CMs Ulaanbaatar" Mongolian text, which is clearly ASCII Mongolian, but it does not work at all.

Oops, Cyrillic Mongolian did also once use ASCII... o_o
Either way happy new year! (It's approaching Chagan Sar)

It's only for Cyrillic script

CMs Ulaanbaatar is Mongolian script not Mongolian cyrillic script. This add-on is just for Cyrillic Mongolian text, not for Mongolian script.

How to use it? Rated 4 out of 5 stars

How to use it? I selected some ASCII text and clicked "convert to Unicode" in the Popup menu, but nothing returns.

Only for Mongolian

This is only for Mongolian cyrillic old fonts like Arial Mon (Monkey, Realmon). It converts old encoding to new unicode Mongolian cyrillic encoding not for all ASCII code.