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zeta101

 
Member Since: May 26, 2005
Location: Walsall, England
Posts: 243
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I think it's because the thumbnail needs to be "actively" applied. This happens when you save something in photoshop (photoshop will make the icon be a preview of the file). You can get utils that do this too. I'm guessing when you check the box "show icon preview" then osx will quickly check the files in the current folder and add an icon preview if it doesn't have one (osx actively applies the thumnails at this point).
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