That is very strange. Hmm there isn't any file called that in the file I've uploaded. I think it should be ok to rename it to "RGSS301.dll". Hopefully that should be the end of the issue!
It seems as though your extractor or something is making the files renamed with the path in it. Any more missing file errors should be solved if you just rename any that have "HentaiQuest" plus whatever folder name it's in to the original name. Or use 7zip to extract your files if there are too many. I think that should have no issues