To add the program (for example Cosmetic Guide):

• Install Cosmetic Guide.
• Open XnView.
• Open your image and go to Filter/Adobe Photoshop Plugin.
  
• Press the "Configure" button in the opened "Plugins manager" window.
  
• Click the "Add" button.
• Choose "Program Files\Tint Guide\Photo Plugins" in the Browse for Folder window.
• Click the "Ok" buttons.
  
• Select Cosmetic Guide in the "Plugins manager".
• Click the "Start".