Warning message in Lion

Does it say "image" or application

Protect your computer from harmful applications

Some harmful applications exist that can cause problems for your computer. Frequently, a harmful application will try to appear as an innocent document, such as a movie or graphic file. These applications, called “trojans,” are most often spread by Internet downloads and email enclosures.

Important: If you receive an application warning and you don’t expect the file to be an application, don’t open the file. Delete it from your computer.

Here are some tips to protect your computer from harmful applications.

• Never download unlicensed or “pirated” software from the Internet.
• Accept only applications you receive from a known and trusted source.
• Run an antivirus program if you find any suspicious files or applications, or if you notice any suspicious behavior on your computer.
• To reduce the amount of exposure to harmful applications or files, limit the number of administrator accounts you create. Consider creating a user account for your daily work and use the administrator account only when you need to install software or administer accounts.
• If you enabled the root user and you don’t currently need it, disable it.

This does not happen for me when downloading an image. What is the extension on the file that you have downloaded?

I'm not seeing the same behavior for .jpg files here. You say it happens when you open a "set" of images... what do you mean by opening a "set"? Does it actually heppen when you're opening an actual .jpg file? Click on one and select File -> Get Info. What's the entire name listed in the Name & Extension box?

I can confirm this is happening for me too.

Opening a jpg, I get a warning msg saying the "application" has been downloaded from the internet, and is asks me if I still want to open it.

I have been trying to figure this out as well... I think for me right now it is only happening with images that I have downlaoded from Google Docs.

Not sure why Lion would give a warning like this for a jpeg... I am surprised that more people are not reporting this issue since Lion has been downloaded over a million times now..

Here is an image, just in canse anyone is wondering....

I think it is only happening with images downloaded after Lion was installed...

I don't have the warning for a jpeg file that I downloaded directly from Safari.

However, if the jpeg file has been downloaded as part of a zip file, I get the warning...

Could have malware in it.

Windows most likely. OS X is detecting code in the image?

My thoughts anyway. 🙂

Doubtful. These are trusted images from known sources (photographers) not images from the internet.

@WayNorth, I think you are right... It IS from zip files. So what does that mean?

This is the message I have been getting:

I run a radio station and get mp3 files sent to me all the time that need editing. This new warning window is a BIG bother!!! How do I turn it off?? Please Apple, don't become like Microsoft with tons of warnings! 😟

I guess for new users warning might be okay, but I know what I have downloaded and I know what I am opening. I hope this can be disabled.

That definitely should not be happening. That warning is only meant to happen for executable files, and obviously a .jpg, no matter how it comes onto your hard drive, is not executable (unless it's not really a .jpg, which doesn't sound like it's the case here). I suspect a bug.

Let Apple know about this at the Apple feedback page, and if you have a developer account and can access it, report it as a bug using the Apple BugReporter.

I for one find these warnings extremely annoying and chose to disable it completely using the Terminal.

Just input:

defaults write com.apple.LaunchServices LSQuarantine -bool NO

and restart.

Should you choose to enable it again just change NO to YES. Pretty straightforward.

EDIT: I agree with Thomas that this is a dangerous thing to do. So depending on how comfortable you are with your downloaded files, USE AT YOUR OWN RISK.

Message was edited by: Fujita Senpai