I wouldn't touch Noteworthy with a bargepole for quality output of any kind. If you have a decent vector (illustration) program, though, you should be able to open a wmf file in it. Vectors are resolution-independent, so if you're careful you ought to be able to re-size it (you may have to combine or group several hundred separate vector objects first) and save in raster format, or even print directly from the vector file. Don't open it in Word, though; the results will be disgusting.

In the end you get what you pay for. Noteworthy is a handy sequencing program, though not as compatible as it ought to be with industry standards. It isn't designed to print scores.