Thank you for the links. However, the link that I posted has some nice formatting that the .dict.dz file lacks.
EDIT: I also own the 2009 DVD version of this dictionary. Perhaps someone could take a look at its files and convert it, too.
Kosciuszko_2009.zip - the whole DVD compressed.
Kosciuszko_2009-db.zip - only the database after installation
I don’t know if it’s useful information but the 2009 database is supposed to be in the Firebird 2.1 format. (user: SYSDBA; password: masterkey).
EDIT2:
Here are the CSV files but I couldn’t make anything useful out of it (DCDICTIONARY_202312171851.csv) with pyglossary. Maybe someone else could help. https://www.mediafire.com/file/fh2cqvnri1uwel6/DCDICTIONARYCATEGORY_202312171851.zip/file