GUI for UPX (Ultimate Packer for eXecutables) Freeware Easy-to-use All functions and options available Description of the functions and options on mouse over Drag and drop function Multiple files support (subdirectories optional) Progress of compression/decompression shown Prompt the user if the chosen file is not executable Saves your settings and able to revert to Default Shell extension into Windows Explorer Textbox for additional options in future versions of UPX