This window keeps showing every time I login Every time I login to my Mac (Lion OS X) I keep getting this windows shown, even when I shut down without the option of reopening the windows when I log back in from here:



This is the window that keeps showing:



How on earth do I stop this for appearing all the time when I login?
I had the same problem, with the same folder. The folder is within the Steam application bundle, and for some unknown reason it gets added to your Login Items.

To stop it showing up when you login:


Open System Preferences
Click the Users &amp; Groups icon
Select the Login Items pane
In the list of items, select the MacOS folder
Click the "-" button to remove it