As of yet only Apple supports mine.

By all means, Apple should recommend and support the use of filename extensions for interoperability.

It could also be used with some earlier System 6 versions, although Apple did not officially support this.

Apple supports several varieties of what it calls "partition maps."

Apple did not officially support the project.

Can you explain the point of comparing the current OS to versions that Apple doesn't support?

Apple doesn't officially support keyboard and mouse computing with ipad, so there is still a market to be addressed there.

I would buy that if Apple would finally support a decent amount of video codecs.

Maybe Apple shouldn't have supported 3G with the new update then?

But mainly, happy to see Apple support the folks that develop for their products.