The file_id.diz quotes the release date at '01/12/95', while the nfo file claims 06/12. It is likely that the group reused the file_id from their previous production
Reservoir Rangers (which was indeed released at that date), and just forgot to change the date.
The accompanying nfo and file_id.diz files mention no specific system requirements, other than the word 'GUS' in the file_id. There is no mention of whether it supports no sound or not.