You can currently only extract the VOICES[].RES files. [] indicates a numeric value; these files are each dialogue files for a singular person (e.g. gorrister, ted, etc.).
All you need to do is drag the VOICE RES file in or select it from your:
DRIVE:\Steam\steamapps\common\IHNMAIMS
(Easy access through Steam: right-click → Manage → Browse local files, then just choose one of the 6 files.)