Illustrator :: Mac Finder Previews For AI Files Not Working

[I'm using fully updated OS X 10.8.5, using Illustrator CS6 16.0.4]
 
In the Finder, all my .AI files show up only as a generic AI file icon. Trying to Preview the files in the Finder also only show the generic icon.
 
I've tracked down the QuickLook Generator locations, and found that I've got a generator named "illust.qlgenerator". But when I run in the Terminal.app this command: "qlmanage -t <ai file>" tells me this:
 
[WARNING] Plug-in at file://localhost/Library/QuickLook/illust.qlgenerator/ is 32bit
[ERROR] Can't load plug-in at file://localhost/Library/QuickLook/illust.qlgenerator/: The bundle “PDF” couldn’t be loaded because it doesn’t contain a version for the current architecture.
 
That Quick Look Generator is only 32-bit, which seems to be causing problems.
 
When I moved it to a different folder to disable it, then the native PDF.qlgenerator takes over, and puts the obnoxious grid behind the previews.
 
Problems with the OS X PDF QuickLook generator: Obnoxious grid behind the actual content instead of resizing to maximize the thumbnailNative .AI files saved without PDF compatibility show no preview, just "This is an AI file without PDF content"To get the preview, saving with PDF compatibility would double the file size. Double.And I still get the grid. 

Is there a native Illustrator QuickLook Generator? I don't want to uninstall and reinstall CS6 just to find there's no difference. Does CS6 install any better previews than I'm getting? Another Mac user with the same setup shows beautiful full-color previews of the same AI sample files without requiring PDF compatibility or the obnoxious grid.