Open the image in your image utility and save it in a format your image editor will recognize (see your software's help documentation for instructions). Be aware that some editors may require you to Import the WMF, then Export the image in the desired format.
NOTE: All of the vector information for your WMF image will be lost if you convert it to a raster format (JPEG, GIF, TIFF, etc.); saving or exporting the image as an EPS should preserve the vector information (verify this with your utility's help documentation).
Open the converted image in your image editor.
Open your WMF image in an application that will support it
Try another image editor.
You might have better luck with a draw program such as Illustrator (Mac users must use version 7.0 or 9.0) or CorelDRAW.
Consult the new image editor's help documentation to see which formats it will accept.
If the new image editor supports WMF, consult its help documentation to learn how to open or insert the image.
Use a word processing or desktop publishing application that supports WMF, such as QuarkXpress, Microsoft Word, or PowerPoint
Consult the application's help documentation to learn how to insert the image.
While you will probably not be able to do much with the image in terms of editing, you should be able to resize and print it.
The onscreen image may appear jaggy, but the printout should look fine if you have a PostScript-compatible printer.
NOTE: All Microsoft word processing applications will accept WMF.