My situation is this, I am using the Spanish version of GOG's "I have no mouth and I must scream". I want to be able to read everything in Spanish but change the audio to the English version that I find better for my liking. Could anyone explain how could I do this? Thank you. My OS is Windows 7.

So. Will this change the audio in the Spanish version? or, will it change the written word in the English version? or neither? I am not very experienced doing this kind of thing but I feel like I could give it a try. Also how do I open the GOG file to change the "SCRIPTS.RES" thank you for the help ;) Oh I found the "SCRIPTS.RES" file.

Yes.

I cannot find the file "SCRIPTS.RES" in the English version of the game. If I just have to copy them I did copy them in the folder "SCREAM" and it did not make any difference. Is that the folder where I should copy it or somewhere else?
Ok I just checked it further and it did change something, it changed the subtitles. I would also like to change the options panel to Spanish if possible. any ideas? That is just because I am curious, is not really that important.

Sorry, I think that's not possible this way. You would have to use the Spanish version and copy English audio files, but I'm not sure if it will works.