The BT torrent file based on the peer-to-peer (P2P) file sharing protocol is an important way to acquire and share network resources nowadays. But sometimes the files list within a torrent file downloaded from Internet can be very disordered, whereas what we need is probably just a part of the listed files. In particular, more and more torrent files were deliberately added a large amount of objectionable AD images, promotional texts, Internet Shortcuts linking to web pages, and other junk files by their makers or spreaders.

The searching result and speed of Windows built-in file search function are really hard to satisfy users. As one of the earliest desktop search tools, ever since Google quitted desktop search field, the well-established Copernic Desktop Search (CDS for short) has gradually become the leader in this field.

The significance of file synchronizing tools is: through simple actions to complete a large number of complex and repetitive, manual file/folder copying, moving operation. SyncToy is a free, easy-to-use, and full automatic file/folder synchronizer produced by Microsoft that supports multiple sync modes and command-line operation.

As an alternative to the most commonly used PDF document format at present, the advantages of DjVu format (from France) are quite obvious: on the premise of storing the same content with same quality, it is much smaller, more readable and opens much faster than PDF. In this case, for any PDF documents with large file size, we might as well convert them into DjVu format, so as to get more convenience.

As a new lossy image file format developed by Google specifically designed to accelerate the Web, under the condition of maintaining the same image quality, WebP format can be much smaller than JPG/JPEG format (reduce 40% or more) in size. But the problem is - WebP is not so popular that could be seen everywhere at present. As a consequence, we may have such needs for now - to convert the WebP format of images to one of the most common formats such as JPG, PNG, or vice versa.