That looks like TextEdit is launching automatically at login/startup, and is opening a temporary/cache file associated with Adobe Photoshop.
-What version of Mac OS X?
-What version of Adobe Photoshop do you have installed?
Depending on which version of OS X, you can check in System Preferences... > Users & Groups or Accounts > click on your user name, click on Login Items and delete TextEdit from the list. You can also right-click/Option-click on the TextEdit icon in the Dock, choose Options from the pop-up menu, and uncheck (click on to remove) Open at Login. After either of the steps above, restart the Mac, and see if the issue is resolved.
I'm using Yosemite 10.10.5 but I don't have Photoshop on the MacBook.
That said I did find text edit in the Login list and deleted it, restarted, and the pop up window is gone.
I'm a happy camper - thanks again