These apps have been around for a while. Why has literally no one succeeded in making an app that converts these formats to something more common? I remember the olden days when to "read" a Pages doc on a Windows computer you had to dig into the .zip folder and extract a PDF of the Quick Look preview. I haven't tried that in a while but presumably it still works. At any rate, how has no one figured out how to convert these proprietary formats into something else?