Peter, you are quite right :
IMSLP #06085 = BWV 897 - Prelude & Fugue in A minor - Composer for the prelude : Cornelius Heinrich Dretzel - Composer for the fugue : unknown
IMSLP #06086 = BWV 905 - Fantasia & Fugue in D minor - Probably apocryphal
IMSLP #06088 = BWV 920 - Fantasia in G minor - Probably apocryphal
IMSLP #06089 = BWV 956 - Fugue in E minor - Probably apocryphal
IMSLP #06090 = BWV 962 - Fugato in E minor - Composer : Johann Georg Albrechtsberger
corrected - IMSLP #06399 = BWV 957 It seems that this piece is not really a fugue, but a Choral Prelude on "Machs mit mir, Gott, nach deiner Güt".
corrected - IMSLP #06407 = BWV Anh.182 - Passacaglia in d minor - Composer : Christian Friedrich Witt
corrected - IMSLP #06408 = BWV Anh.86 - Fantasia in c minor - Probably apocryphal, composer unknown
corrected - IMSLP #06423 = BWV Anh.178 - Toccata quasi Fantasia with Fugue in A major - Composer : Henry Purcell
corrected - IMSLP #06425 = BWV 834 - Allemande in c minor - Probably apocryphal, composer unknown
corrected - IMSLP #06426 = BWV 835 - Allemande in a minor - Composer : Johann Philipp Kirnberger
corrected - IMSLP #06427 = BWV 838 - Allemande & Courante in A major - Composer : Johann Christoph Graupner
corrected - IMSLP #06429 = BWV 845 - Gigue in f minor - Probably apocryphal, composer unknown
corrected - IMSLP #06430 = BWV 907 - Fantasia and Fughetta in B-flat major - Composer : Gottfried Kirchoff
corrected - IMSLP #06431 = BWV 908 - Fantasia and Fughetta in D major - Composer : Gottfried Kirchoff
corrected - IMSLP #06432 = BWV 960 - Unfinished Fugue in e minor - Probably apocryphal, composer unknown
IMSLP #04210 = separate parts of 3 movements of the Cantata for soprano BWV 199 "Mein Herze schwimmt im Blut"
- n°6 : choral "Ich, dein betrübtes Kind" - n°7 : recitativo "Ich lege mich in diese Wunden" - n°8 : aria "Wie freudig ist mein Herz"
The complete cantata has been discovered in 1911 in Copenhagen, and was only known before with these three movements.