Take a scenario where you want your team mates to use your Slide Show but you don’t want them to edit any of existing slides. You cannot obviously send them as PowerPoint Show but Microsoft Office 2010 allows you to convert each of your slides in Presentation into an Image but still give you power to add slides and edit the new ones. These kind of Presentations are called as PowerPoint Picture Presentation.
All you have to do is Go to BackStage of your Presentation and select Save and Send, Next select Change File Type and save it as PowerPoint Picture Presentation. This will save your presentation in pptx format but when you open it, you will see each of your slides now is an image.