Yeah, the black bars at the top and bottom of the tiny preview indicate it is a camera thumbnail, not a large-sized preview embedded in the raw file. Without seeing the raw file, itself, it’s hard to know if there is actually a reasonable-sized preview embedded in it or just the tiny thumbnail. If you want someone else to take a look, upload a raw file to http://www.dropbox.com/ and post a public download link to it, here.
And more importantly, as was just asked, does the image import ok. If so then you’ll just have to do the importing, first, before you sort through what you want.