That is probably the flags:
Code:
# -c0: no compression
# -c1: standard DOC compression
# -c2: Mobipocket huffdic compression
I tested MobiPerl on this (mobi2html) and with -c2 it could not explode the file. If -c2 implies an undocumented compression format you should not use it. And that the current version of MobiPerl does not work for these files is a good reason not to use it.