New problem, I have downloaded a set of Brock's mod presets (tide filles). From the title I can not tell which mod directory to place them in. I do not know how to import the files in the normal way.
Yeah, it could be that if you just rename the extension from zip to h9z you'll be able to drag and drop the file on H9 Control and have it import it.
I don't know why the file extensions are getting changed. Perhaps, Dropbox is being a bit too clever and recognizing that the files are zip files and renaming them.
In any case as Brock pointed out, the h9z files are just zip files, but they have a particular directory structure so the app knows where to look for things and find them. So, it could be just renaming the file will fix the problem.