The icon that is displayed for a file type will reflect the Default Application associated with this type of file. The default application is the program that opens when you double click on them. It is the computer’s “go to” program.
During the Soda PDF installation process, the option Make default to open PDF files is preselected. The new icon which appears is a result of Soda PDF becoming your default application. Your files have not been changed in any way.
Click here to learn how to restore default status to the previous application.