If you are using Nero Photosnap Viewer then you can view pictures as in any viewer - open the program and click on File/Open then browse to wherever your picture is held. But you can't save a picture in Nero - it is just a viewer. The picture must be saved elsewhere in your system.

Or maybe you are using the Nero Multimedia Suite which has more options.

How to View Nero Files Already to Be Written

Writer: Stephen Lilley, eHow Contributor updated: June 08, 2010

The Nero Burning ROM disc-burning software allows you to completely set up a disc to be burned and then pause your progress for later. When this occurs, all of the files on your computer that are ready to be written to a disc are saved in a file on your computer. If you want to view these files, you'll have to open the saved file, which will then display the contents of your soon-to-be-burned disc in Nero Burning ROM.

1 Click "Start."

2 Type the file extension ".nri" into the Search box. This is the file extension of saved Nero Burning ROM project files. The search results that automatically appear on screen will display a list of all of the .nri files on your computer.

3 Click on the saved .nri file in the search results that represents the project that you previously started but have not finished in Nero Burning ROM. The contents of the file will be displayed in a Nero Burning ROM program window.