@MrRipley: IIRC there isn't a "sounds" folder in the original setup, the original sounds are built-in in the game. Thus there'd be no need to save any old sounds - unless of course they're from another pack.
@Rich: There's a huge difference between a folder and a file. If you don't know the difference, it doesn't mean "nobody is able to figure out the difference". You wouldn't call a book a page or vice versa either, would you?
As Skuzzy has warned, removing the sounds(.res)
file when installing a sounds
folder will cause issues. There's a check box in Windows' folder settings for "don't show file extensions" and with it checked replacing one "sounds" with another while not knowing the difference of a file and a folder the results will be undesired.
@Earl: Mitsu's sound pack is a zipped folder. Simply unpacking the zip will result a folder named "Sounds" which can be put directly into the C:\HitechCreations\AcesHigh folder. In case there already exists a folder with that name, you should get a warning about the old one being replaced by the new one. Of course you can check it beforehand: The folder looks like a folded yellow cardboard, the file icon looks more "generic" or "technical".