This is the software publisher's description.
Stand-alone defragmentation tool that doesn't create any installation directories or Registry entries on your computer. Its purpose is to quick defrag files without the need to defrag the whole disk. In addition, WinContig allows you to group files into profiles, and also it accepts a number of optional command-line switches that you can use to control how the program operates.
WinContig is a standalone executable, and it doesn't require any installation process or additional DLLs. In order to start using it, just extract the contents of the ZIP archive to any folder you like, and run it.
WinContig supports two different defragmentation methods. If you choose the Quick method, WinContig does look for the first amount of free space large enough to defragment a file into and uses it. Use this defragmentation method if you use tools like Windows Defrag to defragment your hard disk on a regular basis. If you choose the Smart method, WinContig does look for the amount of free space that best fits a file into ad uses it. Also, if there is no free space large enough to fully defragment a file into, WinContig does try to reduce the number of fragments of that file.