Canon MP490 series On-Screen Manual page 388

For PDF files, you can only select those created with MP Navigator EX. You cannot select PDF
files created with other applications. PDF files edited in other applications cannot be selected
as well.
2.
Click Open PDF file on the list.
The application associated with the .pdf file extension by the operating system starts.
Important
Password-protected PDF files cannot be opened in applications not supporting PDF security.
Files may not open if an application that can be associated with PDF files is not installed.
3.
Use the application to edit/print the file.
For details, refer to the application's manual.
Important
In some applications, the commands (print, edit, etc.) restricted by Permissions Password
may differ from those in MP Navigator EX.
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