Adopted From Amy.Boehman's Blog
When you save a project in Pixie by going to "File" and "Save as", most users do not realize that the project is being saved as a .p3i file (Pixie file). Therefore the picture you created will only open within Pixie software. (See picture below for what a Pixie file looks like.)

Instead, you will need to export your project as either at Movie (.mov or .flv), PDF (.pdf), or podcast (.mv4)

You can also Create Images of each page in the project as a seperate picture file (.JPEG) where each page is saved as individual files. You can also create tent cards, trading cards, booklets, and post cards with this option.
Click on the FULL PAGE option.

The Image Export window will appear. Give the image a name (If there are more than one image, this will be used as the base name and numbers will be appended to the end to give unique image files). Click the down arrow and select a folder to save the image(s).

Click SAVE.