What Is This? Windows Basics
12. Files
12.8. Saving Attachments
When you open an attachment, the computer will read the file extension and open the file in whatever program is the default program for that particular file extension.
In the following example, the attachment was a .jpg or image file and the computer default opened the program in Adobe Photo Elements®. As with most programs, the option to Save the file is in the top left corner of the window.