After downloading Acrobat 9 Pro Extended and creating a presentation (from PowerPoint) with Adobe Presenter 7, you’ll see that there is no preview. Instead there is a blank white page in the preview (see Figure 1).

Figure 1: Notice that the PowerPoint and the PDF document created from Acrobat have a preview, but the document created from Adobe Presenter does not.
See larger image [1]
To create a preview, just make a single one page PDF (typically of your first slide) and then use select Document > Replace Pages in Acrobat and select the one-page PDF that you want to be the preview.

Figure 2: Select Document > Replace Pages in Acrobat to create a preview
See larger image [2]
Next, save the file and now it will appear with a preview – in the operating system and/or in a PDF Portfolio.

Figure 3: All documents now have a preview displayed
See larger image [3]
Links:
[1] http://www.acrobatusers.com/javascript%3AopenPopWindow%28%27/auc/content/tutorials/id_1019/figure_01.jpg%27%2C%27%27%2C%27scrollbars%3Dyes%2Cresizable%3Dyes%2Cwidth%3D1200%2Cheight%3D900%27%29
[2] http://www.acrobatusers.com/javascript%3AopenPopWindow%28%27/auc/content/tutorials/id_1019/figure_02.jpg%27%2C%27%27%2C%27scrollbars%3Dyes%2Cresizable%3Dyes%2Cwidth%3D1200%2Cheight%3D900%27%29
[3] http://www.acrobatusers.com/javascript%3AopenPopWindow%28%27/auc/content/tutorials/id_1019/figure_03.jpg%27%2C%27%27%2C%27scrollbars%3Dyes%2Cresizable%3Dyes%2Cwidth%3D1200%2Cheight%3D900%27%29