UltraExplorer can use Lister Plug-Ins from Total Commander for its viewer. To install a TC Plug-In select View>Viewer>Install Plug in... from the main menu. This will open the Lister Plugin Editor. 

• Add...: Click to add a new lister library (*.wlx file). Browse to the new file and open it.
• Delete: Select a currently installed plugin and press to remove the library from UltraExplorer
• Edit Ext...: Opens the editor to change the options and file types for the plugin (see the Total Commander and the specific plugin help for valid options). See below for details.
• Move Up/Move Down: Changes the order in which the plugins are checked for support of a particular file type
• To enable/disable the plugin check/uncheck the box in front of the plugin

The Extension editor is used to edit the parameter sent to a particular plugin. To load the default parameters (as defined internally by the plugin) press the Load Default button.