Scientific and Technical Document Utility Explorer, if you can get past the complex name, this surely will be a helpful utility for all of us. Lets call this utility as STDU Explorer.
STDU Explorer is a neat little file manager that beats Windows Explorer by providing superior preview and thumbnail options. The program is designed especially for previewing and managing image-file formats such as .psd, .bmp, .png, .gif, .jpg, and .wmf. You can also use STDU Explorer to view Acrobat PDF files and DjVu books (What is DjVu?).
The file manager lets you skim quickly through folders with chock-full of image and PDF files. Finding the one you need is facilitated by STDU Explorer’s thumbnail previews, which you can enlarge, shrink, or otherwise customize on the fly.
The program’s preview pane is great for flipping through multipage files, and its familiar folder tree and Office-like toolbar simplify navigation and basic file-management tasks.
The only useful feature missing from this utility is an address bar for entering folder paths, but otherwise, STDU Explorer is a winner that works with all Windows versions.