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Is there any way to set a custom quick look image in OS X? I'd like a command line tool or applescript to change or embed a custom preview for a file using a jpeg.

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Have you taken a look on ? There might already be quicklook plugin for your filetype... – Asmus Feb 20 '11 at 17:44
I'm dealing with a digital camera RAW file. The preview is created by the camera and doesn't reflect any changes I've made in my RAW converter. – Corey Riggle Feb 20 '11 at 18:41

No. The way Quick Look works is that a plugin, which recognizes your file, is required. Only such plugins can supply images to QL.

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