URI links to folders (in file://blahblahblah format) simply aren't working for us in some cases.

Users with Windows, using Active Directory.

URIs opened from the following don't work:

  • Firefox
  • Links in received emails in MS Outlook (regardless of default browser)

However, the same URIs work in:

  • Internet Explorer
  • Directly entering URI in Start > Run

There are no errors when URI doesn't open; it simply doesn't open.

UPDATE: I am aware there might be a known issue with Firefox. But why in Outlook? What can be causing this?

UPDATE 2: Actual links are more like file:///\\%5c%5c\hostname\path and file://hostname/path/.

  • Is "file://blahblahblah" a realistic example of a URL that isn't working? – Kenster Sep 23 '14 at 14:11
  • @Kenster uh... no. :) – Yehuda Shapira Sep 23 '14 at 14:29
  • Well, "file://blahblahblah" isn't a valid file: URL. Maybe you could provide a more realistic example. The exact letters aren't important, but the number and position of the slashes can be. – Kenster Sep 23 '14 at 14:32
  • @Kenser Updated question. Note that URIs do open in IE and from Run. – Yehuda Shapira Sep 23 '14 at 14:41


This is a browser security measure as it prevents a user from unwittingly accessing the local file system., in firefox e.g. you can turn it on using

user_pref("capability.policy.policynames", "localfilelinks");
user_pref("capability.policy.localfilelinks.sites", "http://yourServer1.companyname.com http://yourServer2.companyname.com");
user_pref("capability.policy.localfilelinks.checkloaduri.enabled", "allAccess");


To add a hyperlink to network file / folder take a look at Outlook: Creating a hyperlink to a network file

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