Hi, first and most hall my time one a pc is on linux mostly Mint so go back to Windows to install apps or sync music in itunes, this is no longer a good practice, I mean go back and forward. You could do this on a virtual machine, but if you don't have Windows it is not possible from virtual machine. Doing it from a browser Chrome / Firefox on Linux/Mac/Windows to manage yours apps on Playbook that is a good thing since the time we spend in front a pc is browsing.
So George J (email@example.com) came with this idea tool that you can do this from a browser thumbs up. From Chrome the install takes a few minutes for full instructions follow http://gridbook.org/pb-app-mgr/ on this page, will give you the instructions based on your browser.
Apps that I have install using the tool/web soundcloud this in not a native app so you have to convert or download one with .bar @ http://apps.goodereader.com/apk-2-bar/, apps that I converted in windows and installed from was Nest, Yatse, Houzz, IMBD, and Unified Remote more or less they all work. Hope this help any of you.
Big Thanks to George J for this great tool.