QTTabBar is a toolbar of Explorer. It is written in C#, provides Tab Browsing feature to Explorer. QTTabBar consists of three parts; TabBar, ButtonBar, and Desktop tool. TabBar is a minimum options. Without this, QTTabBar does not work. It provides a main function of tab browsing. ButtonBar is optional, this provides alternate functions of Explorer standard buttons. Desktop tool is also optional. This provides optional functions that are similar on Explorer window to Desktop.