Have a look into the folder ...
%APPDATA%\Mp3tag
%APPDATA%\Mp3tag\export
resp.
%APPDATA%\Roaming\Mp3tag
%APPDATA%\Roaming\Mp3tag\export
See also ...
Installation & Backup
https://www.google.de/search?q=site%3Aforum...e+%25appdata%25
DD.20151125.0751.CET