From the Hero Games website:
All the characters, equipment and super-skills from Dark Champions in Hero Designer format. (Does not include guns or gun accessories)
Hero Designer is a piece of software that greatly simplifies the creation of HERO System content by providing templates, error-checking, and a full set of powers, skills, etc., and more.
Hero fans (usually uncredited) volunteer to turn content from HERO System titles into Hero Designer format. No artwork is included in HD Character Packs.