Check out movie thumbnailer (mtn) for a fully functional free alternative.
mtn is a command-line program so its usage will mostly be done in a shell or command prompt.
There is a gui tool listed on the download page but I couldn't get it to work.
Code:
http://moviethumbnail.sourceforge.net/
example:
Code:
mtn.exe -w 5000 -c 10 -r 10 input_video.mp4
output: 5000pix wide 10x10 thumbnail