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intellij-ideaintellij-14

How can I determine that files need to be opened with IntelliJ?

I use IntelliJ 14.0.2 Ultimate on a Mac. When I first opened a specific file I determined that this file (and all others of that type) need to be opened with an external editor. For example, I specified that .md files need to be opened with TextWrangler.

How can I change it back to IntelliJ again?

Solution
    1. Go to Setting (Crtl+Alt+S or ⌘,) | Editor | File Types
    2. In "Recognized File Types" pane (at the top), find the Files Opened in Associated Applications entry and select it
    3. In the "Registered Patterns" pane, find the *.md (and/or *.mkd, *.markdown, etc.) entry. Select it and remove it via the delete button enter image description here on the right
    4. Click OK to close the settings dialog

    You can then register the extension as plain text, or install the third-party Markdown plug-in (IDEA Plug-In Repository Page, Project's GitHub Page). The Plug-in will auto-register markdown file extensions to open and be handled by the plug-in.