Sepham FileXplorer 5 is an images, texts and multimedia files freeware and multilanguage viewer. It does the preview of every file on your computer, based on the real content of the files, not on the extension simply dragging files over it. Try it, it's free.
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Explorable file types:<br/>
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Images: bmp, rle, dib, gif, jpg, jpeg, emf, wmf, tif, tiff<br/>
Texts: txt, rtf, log<br/>
Multimedia: avi, asf, asx, wav, wax, wma, wm, m3u, mp2v, mpg, mpeg, m1v, mp2, mp3, m3u, mpa, mpe, mpv2, vob, aif, aifc, aiff, au, snd, ivf, mov, qt<br/>
...and many many other!