
Good question... I never even thought to expand.
Okay, you know what you did
C9... you found the "smallest" folder and then you dumped the contents.... right? Okay, so after you've done that, take that same empty folder and do what you did, but rename the file "empty folder" !

Next time you've created a special set and want to save it independtly, just load up that "empty folder" (fill 'er up) and save under a recognizable name. Always keep your "empty file"
EMPTY (shapes, custom brushes, whatever....) for this very reason... creating your own custom files! Works for all 'PS presets'!