From STD Utility
STDU Explorer is a piece of software that offers you the opportunity to work with image files (support psd, bmp, png, gif, jpeg, wmf formats) and e-books in DjVu and PDF formats. This application helps you quickly view and find books or image files.
STDU Explorer supports standard operations such as moving, copying, pasting, renamming, deleting, etc. But its possibilities are much wider
* Extended representation of files list, with adjustable thumbnails size.
* Fast preview any page of multipage documents.
* Fast access to a tree of bookmarks in PDF or DjVu files.