title: What does IDEA use to determine the application to open a file with?
body: <p>In <em>Settings > Editor > File Types</em> there is an item "Files Opened In Associated Applications" which is, as far as I understand, used to specify which files should be opened with an external application rather than in editor in IDEA. How are file associations configured? This doesn't seem to use <code>xdg-open</code> as I would expect it to.</p>