Yes, Microsoft is making great strides with Windows 8. Yes, Microsoft is making a document reader. Yes, it is a document reader… but there is a reason why this is noteworthy. Why? It’s called AppX. This Windows 8 document reader is the first known application for Windows 8 that will utilize AppX technology. AppX is a new packaging technology that will make applications act more Windows Phone 7 apps. They will be self-contained packages that can be used to run and install applications to the operating system. And if it sounds a lot like what Mac OS X already does… well… yeah…: Of even more interest,…