A preview image of the document shows what is in the document before you open it. You can preview documents in dialog boxes used to open or insert files.
On the Application menu, point to Properties, then choose File Properties.
On the Preview tab of the Properties dialog box, click Create Preview Now to save a preview image of the document. The image that appears in the active window is saved as a preview image.
Tip:
You can update the preview image each time you save the document by setting the On Save option.