Basically there's 2 versions of the database file, the old (KDB) and the new (KDBX) which has more features/fields/etc. For the clients, 2.x uses KDBX files, b

Basically there's 2 versions of the database file, the old (KDB) and the new (KDBX) which has more features/fields/etc. For the clients, 2.x uses KDBX files, but is also compatible with the older KDB files, while 1.x can only use the older KDB files.