open a cmd prompt cd to the folder with the hpk files, make sure hpk.exe is in the same folder, and use
hpk.exe extract folder_to_extract_files_to archive_name.hpk
https://www.bleepingcomputer.com/tutorials/windows-command-prompt-introduction/
hpk.exe extract folder_to_extract_files_to archive_name.hpk
https://www.bleepingcomputer.com/tutorials/windows-command-prompt-introduction/