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Every time I open the "Amazon MP3 Downloader" app (by downloading a new MP3 from Amazon.com in Safari) I get this dialog box: alt text

I'm used to seeing this the first time after I open a new app I've downloaded, but usually I don't see the dialog box after the first time I press the "Open" button.

Is there a setting somewhere I can use to indicate that yes, I am sure I want to open "Amazon MP3 Downloader" without this dialog box?

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4 Answers

up vote 4 down vote accepted

If you need to do this manually on a file (or files) you can run the following command to remove the Quarantine flag:

xattr -d com.apple.quarantine /PATH/TO/FILE(S)

So in your case since the quarantine flag is not being removed you will want to run the command with sudo as the primary cause for the flag not being removed after hitting "Open" is because you don't have permissions to do so.

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The quarantine flag does seem to be removed for other applications I've downloaded since. Are the permissions set separately for each app? –  Daryl Spitzer Sep 8 '10 at 22:40
    
How do I give myself permission to remove quarantine flags? –  Daryl Spitzer Sep 8 '10 at 22:41
    
@Daryl Spitzer: Most likely it's just because of Amazon's app only. Using sudo in front of that command will allow you to do the command as if you were root and make sure it takes effect. If it fails to work, change -d to -dr and run it with sudo in case there is another program inside with the flag. –  Chealion Sep 8 '10 at 22:47
1  
xattr worked (with the -d option) but I did need to use sudo –  Daryl Spitzer Sep 10 '10 at 18:31
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Create a file called com.apple.DownloadAssessment.plist under Library/Preferences with the following:

<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN"
   "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
  <dict>
    <key>LSRiskCategoryNeutral</key>
    <dict>
      <key>LSRiskCategoryContentTypes</key>
      <array>
        <string>public.item</string>
      </array>
    </dict>
  </dict>
</plist>

Then log out and then log back in.

Instructions for Snow Leopard are a bit different.

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Will this turn off the alert message when downloading other (new) applications? –  Daryl Spitzer Sep 8 '10 at 22:37
    
@Daryl: Yes. Otherwise you can use Chealion's solution to manually remove the quarantine flag. –  Josh K Sep 9 '10 at 13:20
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if you use Deeper you can mark it in General tab.

alt text

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Good information, but I just want to turn off the alert for the one particular app. –  Daryl Spitzer Sep 8 '10 at 22:39
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Deeper would be a good choice but I would suggest you to use OnyX

OnyX provides a few more features than Deeper, allowing you to verify the Startup Disk and the structure of its System files and to delete caches. alt text

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Good information, but I just want to turn off the alert for the one particular app. –  Daryl Spitzer Sep 8 '10 at 22:38
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