Files wrongly considered as damaged in encfs volume I am using encfs @1.7.5 and osxfuse @2.6.4 installed via MacPorts 2.2.1 on my MacBook Pro Retina Late 2013 which is running OS X Mavericks 10.9.2.  When opening certain files (e.g. xlsx, pdf) in my encfs volume, I get an error "X is damaged and can't be opened." as well as a suggestion to move it to trash.  However, when I copy that file elsewhere (i.e. not on the encfs volume), it appears to work just fine.  Why is this?

EDIT: I looked online and found a post involving disabling GateKeeper.  It did the trick.  In essence, you go into "Security Preferences -> Security &amp; Privacy -> Allow applications downloaded from: Anywhere".

I understand that the solution works, but I would like to know why it works.  Thanks in advance.

EDIT 2: Also, if someone could tag my post with encfs, it'd be very appreciated.
I've found the answer here (for BoxCryptor):

Under special circumstances, Mac OS X adds the extended attribute 'com.apple.quarantine' to a file which was e.g. downloaded from the internet. This can also happen to files within the BoxCryptor Folder. If an encrypted file has this extended attribute set, you receive the &quot;is damaged&quot; error message when trying to open the plaintext file in the BoxCryptor Volume.

Also try this, more secure workaround:

x) Open Terminal (Applications -&gt; Utilities)
y) Run the following command (substitute the path):
$ xattr -r -d com.apple.quarantine /path/to/encfs/mount/point