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In Mac OS X 10.5.8 whenever I download an app etc, then open it I get the "This app was downloaded from the internet are you sure you want to open it" dialogue. Never did it with Tiger... Does anyone know how to turn it off?

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up vote 4 down vote accepted

You can do a term edit to disable this.

Directions here.

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WOW ! thanks JNK, that has to be the fastest help ever :-) cheers GB –  Gary Braid Jul 26 '10 at 15:40
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The quarantine feature is new as of Mac OS X 10.5 - it's designed to make it more obvious what is new software when you first run it. (Primarily to help protect users from trojan horse attacks). Apple has made all the really deep technical details of it's file quarantine feature available.

To disable it you need to run:

defaults write com.apple.LaunchServices LSQuarantine -bool NO

in the Terminal. You'll need to restart for it to take effect.

On existing files you can run xattr -d com.apple.quarantine /PATH/TO/FILE to remove the quarantine flag.

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Thank you too Chealion ! –  Gary Braid Jul 26 '10 at 15:51
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