Marita,
There are programs to convert bitmap images to vector images. For example, you could explore the links at:
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http://graphicssoft.about.com/cs/bitmaptovector/index.htm>
Xaos Tools’ Segmation can allow you to save as several vector formats, including AI (Adobe Illustrator 7), EPS, CGM, and several others. They claim WMF, but I can’t seem to get that to work. Segmation hasn’t been updated since the original release and, while it works well with my Photoshop 5.0.2, I doubt that it works with higher versions of Photoshop.
Other forum members have sought vector conversion as a solution to low quality enlargements of their bitmaps. Perhaps you simply need a better way of enlarging your bitmaps, such as Qimage, Genuine Fractals, or S-Spline.
Another program to look at is Focus Magic. You might want to download its demo and see how well it works on your images. Focus Magic can enlarge your image in a way that I think is nice.
I also have Genuine Fractals and use it for really big enlargements, but GF costs more than Focus Magic and works in a completely different way. Focus Magic can also Despeckle and Focus an image, so it has several uses. Focus Magic’s deconvolution engine makes it unique among graphic utilities. For your purposes Focus Magic might be better than Genuine Fractals. Focus Magic comes in both a standalone version and a Photoshop plug-in.
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http://www.focusmagic.com>
— Burton — (not associated with any vendors mentioned)