You allow Vindictus to patch, and then you go into /Vindictus/en-US/hfs and pick an .hfs out of there to edit. For the most common keybinds, you would want FAC6B533E4D245CE8B9A67DB1472B2B98F3F54FA.hfs
You also have to run Winzip as administrator to have permission to edit the .zip.
In retrospect, that might have worked for 7-Zip too, but I'm not gonna test that now.