Let the user choose whether to navigate folders or open bundles

[tobihagemann]

There is no way to tell if a folder named "abc.xyz" is a folder or a known bundle type. Thus the final choice should be made by the user.

Proposal by @overheadhunter: Whenever there is a "." in a folder's name, show a popover dialog / action sheet / ... and ask if the user wants to open the bundle with a 3rd party app or browse the folder.