Harry, thanks for moving this.
Not that it matters for the current problem, but I see from the file that RWood originally posted, that BD uses a code of "TEXtREAd", which corresponds to "Palm DOC" and not "MobiPocket". This is according to the MobileRead Wiki
https://wiki.mobileread.com/wiki/PDB. As far as reader software displaying the ebook, I don't know if it matters or not.