stock art

I recently visited a garage sale and purchased an old clip art/stock image collection from "Hemera" called The Big Box of Art. While the (windows) software itself provides an index and a browser, I was only interested in using the images and none of the software. Unfortunately, the image files were in a passel of zip files and included two formats I was not sure how to handle; Windows Metafile (*.wmf) and "HPI" files.