Details of the chain of information, from the UTI of the file to be opened, through LaunchServices’ database of document types. How to deal with problems.
lsappinfo
What if, when you double-click a document, the wrong app tries to open it, or maybe the right app but wrong version? Includes command tool use.
How to get all sorts of useful information about a running app or process from LaunchServices: and introduction to using lsappinfo.
The Eclectic Light Company 