Command line to update thumbs.db?

I have a server with several TB of images. You can think of it as a
sort of imaging server. There are around 10 million images in
thousands of directories. These uploaded from interfaces, so the
users have read-only rights to the entire server.

When the users browse a folder, they don't have rights to create/
update thumbs.db. So they have to generate the thumbnails each time,
in memory.

I'd like to have the thumbs.db autocreate. Is there any way to do
this? A command line perhaps? I'm a programmer, so if there is a
way to program this then I'm all ears. Worst case I can imagine is
recursively navigate the directories in a program, and launch each
directory in Explorer, forcing thumbnail view (already have code to do
this in my imaging viewer) however the problem is that Explorer only
creates thumbnails for the first page of images and there is no way to
tell when it is done.

Any ideas?

Thanks!