It is an export format for the Hero Designer software. You put it in the Hero Designer directory, and when you have a character built in Hero Designer, from the dropdown menus you select Current Character/Export/Set Export Format. You select the above file. Then select Current Character/Export/Preview Character, which will then export the character in HTML which will automatically open in your browser. Open that browser page and from the browser select print. That will give you the option to save the page as a PDF. Alternatively, if you want an HTML file instead (which you could then view in your browser), select instead Current Character/Export/Export to File.
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