Jacques Gideon van Wyk

I’ve taken a look at this. The available documentation for Uniform Type Identifiers appears to be the out of date [Uniform Type Identifiers Overview](https://developer.apple.com/library/archive/documentation/FileManagement/Conceptual/understanding_utis/understand_utis_intro/understand_utis_intro.html#//apple_ref/doc/uid/TP40001319-CH201-SW1), the out of date [System Declared...

> I'm sorry for the late response to this (especially since you looked into this in #1169 a few months ago). But looking through this, I am still a little...

One thing I noticed while updating the CFBundleDocumentTypes was the use of LSIsAppleDefaultForType, which appears to be undocumented (and I would guess is intended to be private). Should this be...