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Gatekeeper, introduced in OS X Mountain Lion (and subsequently added to OS X Lion via the 10.7.5 update), is a security feature that lets users define which apps can run on their Mac based on the app’s source.
#Onyx mac os x lion 10.7.5 software#
It’s important to point out that, despite similar functionality, language, and intent, the Harmful Software Warning is technically separate from OS X’s Gatekeeper security settings, although the two can indeed cross paths in certain circumstances. Note that this is a user-level command, so you’ll need to perform this process for each user account on your Mac in which you want to disable the Harmful Software Warning. This does indeed potentially put you at greater risk, but if you’re careful about where you obtain your files online, and if you’re careful about which files you choose to open, then disabling this feature can eliminate a big annoyance and ensure that OS X won’t ever ask you if you’re “sure you want to open this file” again. When you launch the app or open your test file, you’ll notice that the action executes without the Harmful Software Warning. When you log back in to OS X, try to open a downloaded file that previously would have produced the warning message (a handy app like Handbrake is a good way to test if you don’t have any other downloaded files ready and waiting). You’ll need to restart your Mac in order for the change to take effect, so save all open files and reboot.
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Launch Terminal from the Applications > Utilities folder (or search for it with Spotlight), copy and paste the following command into the Terminal window, and then press Return to execute it.ĭefaults write LSQuarantine -bool NO Thankfully, you can disable the “are you sure you want to open this file?” warning message with a quick trip to the Terminal. But for power users who are constantly downloading and opening apps and files, the Harmful Software Warning serves primarily as an annoying and frustrating workflow interruption. This is probably a good thing for less experienced users, who don’t fully understand that malware and viruses often masquerade as common file types. When this warning message is triggered, instead of simply opening the file or application, the user is forced to stop, make sure that the file being opened is the intended one, and then manually click “Open” in order to proceed. But we use the “generally” qualifier deliberately, because sometimes OS X can go a bit too far, especially when it comes to more advanced users who understand the risks and are comfortable operating with a higher level of control.Ī great example of an OS X security feature that can be more annoying than helpful is the Harmful Software Warning, also known as the “are you sure you want to open this file?” message, which pops up virtually every time a user attempts to open a downloaded file that didn’t originate in Mac App Store or from a trusted and signed developer. One of the generally positive aspects of OS X is that the operating system attempts to protect the user from actions or events that can harm the system or endanger a user’s data, such as preventing the modification of core system files and proactively disabling insecure browser plugins.
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How to Disable ‘Are You Sure You Want to Open This File?’ Warnings in OS X