Can you detail it ?
Well, I thought of a special line in explorer's context menu for all chosen movie-filetypes (mov, mpg, rm etc.). The line should be something like "create thumbnail overview". When clicking on a movie-file or a folder containing movie-files with right mouse button, context menu comes and You could create a thumbnail overview file with default settings. Program then runs in Background an closes after finishing.
Basically like "create rar archive".
I actually already tried to pass a file to Your programm by putting a link into the "send to" folder with link target "C:\progam files\Video Thumbnails Maker\VideoThumbnailsMaker.exe" %1. But this works only if Your exe would support command line...