What types of files modified by the System Restore?

Restore system modifies the Windows system files, registry settings and programs installed on your computer. Scripts, batch files and other types of executable files can also be modified on your computer. Personal files such as documents, emails, photos and audio files are not modified.

For example, if you upload a personal file, such as a picture from a digital camera on Friday, and then restore the state of your computer as it was two days ago, the picture will always on your computer.

However, if you install a program for viewing photos on Friday, and then restore the state of your computer as it was two days before, System Restore will uninstall the program, and you can not use to view photos.