Files sent as attachments could be anything - a Word Document, Sound File, Image file etc.
The type of file is indicated by its EXTENSION e.g. PICTURE.JPG where "PICTURE" is the name of the file and ".JPG" is the file extension indicating ( in this case ) that it is an image file.
You may or may not be able to see the extension part of the file name which can depend on various setings in your e-mail browser and also on your PC.
To see these extensions all the time, open up Windows Explorer and click :
Tools / Folder Options / View and then uncheck the box for "Hide extensions for known file types"
Once you know what type of file you have received as the attachment, you need to make sure that Paint Shop Pro is configured to open files of that type :
Using ".jpg" as our example -
Start Paint Shop Pro.
Click on the "File" Menu and from the drop down menus select "Preferences" then "File Format Associations"
You will be presented with a list of different file EXTENSIONS. Scroll down the list to find the one you want and tick the box.
Click on "OK" to close the window.
Next time you click on any file with a ".jpg" extension it should open in Paint Shop Pro.