Rated 5 out of 5 stars

Great! I was very upset when saw that one of my newsgroups is not readable after upgrade to TB 91, as messages there were not is UTF-8. This addon allows reading it.
It has two gotchas however.
- It does not work for message list pane (subjects in message list are sill <?>). At least for my KOI8-R encoding.
- It does not remember the selected charset, so when I select a message again, I still need to go to menu and choose the charset. For me, the ideal extension will allow to override a charset for a folder.

This review is for a previous version of the add-on (1.0.3). 

Newsgroups are another kettle of fish, sadly. Usually subjects should be pure ASCII and RFC2047 encoded or raw UTF-8. I know that newsgroups have some funny ideas.

The charset per folder was removed in TB 91, right?

In the account setting for News / Server Settings there is a "Default Text Encoding". Does that help?

Please send me an e-mail with the details of the newsgroup.