Guilmant's Fourth Sonata, played on the wonderful sample set of St. Etienne in Caen.
I added some reverb to the recording (in Audacity) and to me that sounds just right!
A) Allegro assai
B) Andante (5'02)
C) Menuetto: Allegretto (9'49)
D) Finale: Adagio-Allegro vivace con fuoco (15'34)