Self created tag is disappeared

Dear support, dear community

I created longer time ago a tag with rarely needed additional information on my mp3 files. After upgrading my OS to windows 10 MP3tag run well without reinstallation but I miss one not standard tag I created.

The information content is rarely used and this is the reason why I forgot the tagname for successful recuparation. I did not saveguard the configuration (as one should do :wink: )
Nevertheless the missed information is still embedded in every mp3-file of course.

How to get all tags listed with help of mp3tag, even those of which the name and also both %--% - information are no more in mind?

Thanks for help

You can start Mp3tag, load your songs, select one of your songs containing your non standard tag and press ALT+T. This should show all your actual tags in this song.