Files with the .avery file extension are created by Avery's Design and Print Online Web application. You can't double-click these files to open them; you must open them from Avery's Web page.

Scroll down to the "Manufacturers" section of the templates list and click the "Avery" folder to open it. There may be multiple Avery folders, such as "Avery A4/A5" and "Avery US Letter," so be ...