Snoshrk: It's a journalled tagged binary file format with range-indexed trees and free block lists. Not so good for manipulating with external utilities, but very good for preventing file corruption and for quickly finding stuff overlapping a date range. In short, don't expect to be able to manipulate it without building something using the Seqretary source code. If you did want to try that, the header files you would be interested in would be eventdb.h, event.h, schedhead.h, schedtime.h and schalarm.h