App update for an app I never bought

Question

I have both Angry Birds and Angry Birds Space for my iPhone, but never bought the app for my Macbook Pro.
Recently I have gone on to the Mac App Store and found an update for Angry Birds, which I found rather odd.
When I click update - it comes up with the log in box, and a completely different apple ID to mine. I contacted support and got this response:
Hello Matthew,
******* here from iTunes Store support!
As an Advisor for the iTunes Store, I handle issues related to billing, downloading, customer accounts, and the items available on the iTunes Store. Although your question falls outside of my area of specialty, I will be happy to assist you with resolving your issue.
Listed below are some helpful tips and links. Once you have found a category that relates to your issue, follow the instructions or click on the associated link to go to that page.
To post questions and read answers provided by other iTunes users, you can participate in iTunes discussions at our Apple Support Communities forums:
http://discussions.apple.com/category.jspa?categoryID=149
If you require more assistance, you may wish to call our AppleCare technical support team. A technical Advisor will be able to tell you about Apple's complimentary and fee-based support. The technical Advisor can also assist you in determining what option might be most helpful to you in this case. To find the appropriate phone number, please visit:
http://www.apple.com/support/contact/phone_contacts.html
Matthew, I do hope that this information is helpful in resolving your issue with "Angry Birds". Please don't hesitate to write back if you need further assistance with your issue. If you reply directly to this email, your response will come straight to me.
Thank you for contacting iTunes Store Customer Support. I hope that you continue to enjoy the iTunes Store. Have a great day.
Sincerely,
Now to me, support should know what they are doing. And referring me to a community forum - surely isn't going to help? That's what I think anyway, but I'm here so I am hoping someone knows what's going on - can help me/know what I need to do to get rid of it.
Oh and I tried putting my own apple ID and hitting update - but that comes up saying "store error".

Answer 1

The Apple Support Communities are an international user to user technical support forum. As a man from Mexico my first language is Spanish. I do not speak English, however I do write in English with the aid of the Mac OS X spelling and grammar checks. I also live in a culture perhaps very very different from your own. When offering advice in the ASC, my comments are not meant to be anything more than helpful and certainly not to be taken as insults.
Unfortunately she has been misdirecting folks with that update bug link for far too long.
Candidly, when you see the Apple ID for a stranger appear in the Mac App Store (MAS) on your Mac regarding an update for an app that you haven't bought, it is a notice that you have a pirated app that you got from an outside source. Some trial version or a "free" version is actually a MAS version that someone has cracked and is distributing.
Finding a pirated app
All MAS apps have a MAS receipt in their app bundle. Check any app acquired from the MAS. Right click on the app's icon in your Apps folder and choose Show package contents. In the Contents folder is a _MASReceipt folder and in that folder is the coded MAS receipt. It has the Apple ID of the MAS account that bought/acquired the app from the MAS. It is that receipt that the MAS uses to alert you that an app has an update. There would not be a notice of an update with someone else's Apple ID showing in the MAS on your Mac, if there was not an app with a receipt from this person's account somewhere on your Mac.
Download the free app FindAnyFile (FAF);
http://apps.tempel.org/FindAnyFile/
This app is easier to use and seems to be more powerful than Spotlight. Open FAF and in the box type _MASReceipt and press Find. It should come up with a list of every app on the Mac with a MAS receipt. Compare the apps with receipts in FAF's list with your purchased apps list in the Mac App Store. The odd app out should be the pirated app.