You can 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.)
Due to copyright restrictions, the CD Sample Files SAMPLE.OPL and SAMPLE.AD are no longer available for direct download.
Note: Please read the MUSICFM FM/GM Files section for more infromation.
The extraction of MUSICFM.RES and MUSICGM.RES files requires the SAMPLE.OPL and SAMPLE.AD files.
Due to copyright issues, these files are not available, but you can still try to extract the MUSIC-.RES files, they won't work though, currently I'll just split it into non-functional sections, still, I personally advise you to still give this a shot.
Similar to VOICES[].RES files SCRIPTS.RES are now able to be extracted.
The extracted files will be split into their segments, as read in the file, there will be some "Junk" left in the beginning and potentially end of the file. Otherwise it should be the entire game Text content. All Text is in these files.
IMPORTANT NOTE: I'm not sure if the sample files are fully functional. The files come from a CD version of the game, and they are required for extracting certain files.