Although µTorrent is mostly self-contained, there has to be a location where it can store its settings for later use after the first run. Because µTorrent does not use the Windows Registry, it has to store its configuration in files on separate files on the disk. By default, those files are located at %AppData%\uTorrent, which can be easily accessed by visiting "Start" > "Run" (or by pressing Windows+R on the keyboard), typing it into the "Open" field, and pressing "OK." Typically, you'll find several .dat files in the settings directory:

Note that it is normal to find .dat.old and .dat.*.bad files in the same directory. The former file type denotes good backup files for the case that the corresponding .dat file becomes corrupted. The latter file type denotes backups of corrupted files, which may be sent to the developer for analysis if necessary.

In addition to .dat, .dat.old, and .dat.*.bad files, µTorrent stores loaded .torrent files in its settings directory unless a storage location is specified. These files need to be stored in order for µTorrent to work properly, so do not delete them unless you are absolutely sure µTorrent no longer has the associated torrent job loaded any longer. If you want µTorrent to delete the stored .torrent files automatically upon removal of the torrent job, see the description of the Remove button in the toolbar.

Encapsulated "Installation"

While %AppData%\uTorrent is the default directory for storing the settings, µTorrent actually searches the directory that the executable file is located in first before looking in %AppData%\uTorrent. As such, so long as the directory that the executable is located in contains a settings.dat file (even a blank one), µTorrent will look no further, and use only the files located in its current directory instead. With this behavior, it is possible to create encapsulated µTorrent "installations" for use on portable flash drives, or just to have an isolated copy for any other reason.

If you don't already have an encapsulated install, you can manually move the contents of %AppData%\uTorrent into the same directory as the µTorrent executable to create such an install.

External Files

Besides the default .dat files, µTorrent can make use of several other files external from the executable. Such files may modify several subtle behaviors in µTorrent, or allow you to customize the graphical look and feel of µTorrent. What all external files have in common is the location at which they should be placed -- the settings directory.

Extended Functionality

Interface Customization

External files that change the µTorrent interface are numerous, but thankfully, there is a central repository where you can find many of them. Check out the µTorrent Skins Page for your skinning needs! If you ever decide to create your own interface files, feel free to submit them on that page, and inform us about it in the forums!