Nope, HDRI images don't show in the file dialog by default - for some reason they don't register as an image type (there is an .INI file setting you can make to rectify this, but I can't remember it off the top of my head)...
Anyhow, the easy way to find them, is to look in your Lightwave installation directory under .../images/HDRI and then change the 'Files of type' field to show 'All files (*.*)', et voila...
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