Problem with "Always Open With" in OS X I want know how can I apply a software to open all my same document, for example I want to open all my PDF document with Skim but when I right click on it> open with > other and choose my desired application and check the "Always Open With" it just do for that specific file.(mean always open A.pdf with skim if I want to open B.pdf still open with "preview").

How can I force OS X to open all pdf type with Skim.
From the Finder, select a PDF file, open the Info panel (File ➔ Get Info or ⌘I), select your preferred application and then click Change All…