How to Open Notebook Files
Not all districts are keen to have their teachers download and install programs on their school computers. So, if you want to open notebook files without downloading a dedicated program, you can use SMART Notebook Express - an online version of the SMART Notebook Interactive Viewer.
Notebook Express has many useful functions including pen tools and text functions. You can add and delete slides, sort pages, move objects, run flash files, and even create and save notebook files of your own. Again, it has less features than the full version of Notebook, but it has the convenience of being online, and can again be used with other brands of interactive whiteboards or with an LCD projector.
This software can be used online by both Mac and PC users, and is great for teachers who do not always have access to the full version of Notebook because they are off campus or have computer problems. These solutions are obviously not as good as the original software, but they are still a good backup for a multitude of scenarios. Those running Linux can download a version as well.
Another resource is the Notebook Interactive Viewer, which is available for Windows computers. The software allows you to either view content created by those with a SMART Notebook, or share content you created with those who do not own the full software.