Originally Posted by cybmole
ok - I see how that could be useful.
can it be used from within calibre, as the default mobi format viewer - that would be handy for checking conversions prior to actually sending them to Kindle
I can't say for certain but I don't believe so.
You can't really get it to open files any way other than starting it up and clicking on open file or dragging-n-dropping onto the open app. I've tried to set it as the default viewer in Windows and, while it will load upon double-clicking a mobi file, the mobi won't actually load. Same goes for right-clicking a mobi and selecting Open with.