Not sure where to ask this because it's not hardware related or HTML related, so I'll ask here :)

Is there a utility or function in Windows 2000 that allows batch conversion of files from one extension to another?  I need to make a whole lot of thumbnails for some presets for a graphic filter/plugin. What I've been doing because I'm dyslexic is copying the preset file to a separate folder and changing the file extension to .jpg, and then creating the .jpg thumbnail and over writing that file. This way I don't have to worry about mistyping the file name.

I've tried a batch conversion inside Paint Shop Pro, but because the files I want to change the extension of aren't graphic files PSP can't open them to convert them.

Is there a utility that will make this process less painful or am I stuck renaming several hundred files manually one by one?

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi