Convert KBD to DOC

Unfortunately, we do not know about any specific kdb to doc conversion or what it might be, considering that none of the known .kdb files are documents or text files, but databases. Perhaps it is searched by users looking for a way to export the contents of the databases as text files, but this can only be done using their original software - if it even can be done. In case of KeePass database, you will also need to know password.

You can find universal database viewers, but but these might not actually support every known database, just the most common ones. Still it's worth a try especially if you do not know the origins of your .kdb database.