Another trick that I've used with nearly any WinBlows program (on Win2000 and WinXP, others may work):
ctrl-alt-PrintScr will capture the image of the active window to the clipboard. Open Microsoft Paint and Edit-Paste the image into Paint. You can then save it as a ".bmp" file and convert it from there.
Some programs override this somehow. For those, Alt-PrintScr will capture the entire screen to the clipboard, which can then be pasted into Paint.
I know it's gross, and not precisely what you're trying to do, but I've done this in a pinch a number of times just so I could show what I was seeing to someone else.