Same way as config.pk
Lol I thought you was joking at first. Anyway you just drag the pk files to the intpacker and it will make a folder with all the dat files unpacked in a folder. When you done editing the files you just drag the folder to the intpacker to pack it into pk file. When you drag the pk file or folder to intpacker a window will open where for config.pk and m_config.pk you type c and press enter as for e.pk you type e and press enter.
Hope that helps.