Originally Posted by pdurrant
[Enhancement: Now includes Start guide item in the opf]
Now here's version 23.
Just uploaded version 23. Mobipocket books can include a pointer to where the book should open to when first opened (often the first page of the first chapter, skipping all the prelims).
Version 23 of MobiUnpack now writes this info out in the .opf file, so that it's preserved if the Mobipocket file is re-built from mobiunpack's output using Kindlegen.