Rated 5 out of 5 stars

The add-on works great, but it has one limitation that I can't get around. The "Save Message as File" option saves the file without national diacritics. i.e. e.g. replaces "ą" with "a". Can you do something about it?

Đánh giá này là cho một phiên bản trước của tiện ích (3.6.1). 

replacing a safety feature by the original author - can you raise a github issue / feature request for allowing other characters?
https://github.com/RealRaven2000/FiltaQuilla/issues