Comment # 4 on bug 952799 from Ole-Bj�rn Tuftedal

On upgrading from Leap 43.2 to 15.0, bogofilter ignored the existing
wordlist.db in directory .bogofilter, and started a new wordlist.kct. This in
spite of running bogofilter-db (and not bogofilter-kyotocabinet, as the
filetype might suggest).
The effect of this is that bogofilter starts with a blank sheet, without any
knowledge of what is spam and what is ham.

The actual file format of the two is the same, so a workaround was to copy the
wordlist.db to wordlist.kct (or rename if one doesn't want the original just in
case).