Originally Posted by Methanoid
. You don't get TOSEC sets using this for example. Maybe they could
To be fair, you can import TOSEC ADFs and convert them to RP9. Yeah, it's only of use to AF2009 users - theoretically other emulator front-ends could make use of it, but few do.
And to be fair, Microsoft Office 2007 and Open Office file formats are zips with an XML definition - I think that's an increasingly common way to define file formats.