I have Windows 7 x64 installed along with Adobe Reader X, Photoshop CS5, and Illustrator CS5. I have noticed that these dont have a thumbnail generated for them. What I need is an All-in-One Thumbnail Viewer for .ai, .psd, .pdf, .eps, etc. I prefer freeware or a registry hack of some sort. I dont want to spend money just to view a thumbnail.
Another option is described here. The article is from 2008 though, so probably predates your version of Photoshop.
It involves downloading a DLL and installing it in