I'm not having much luck figuring out how Windows Explorer thumbnail icons are generated, or how to modify it.
Is it just a matter of configuring a program to spit out thumbnail images (like ImageMagick with some command line options) and tying it to the file extension in the registry somehow?
Or does it require writing and compiling custom code? If so, what and how? Could a simple wrapper be written that feeds the filename to another program, and then looks for the generated thumbnail image in a pre-designated place?
(I'm asking from an end-user perspective, rather than a programmer's perspective. "How do I generate custom thumbnails on my own computer for certain files with minimal coding?" Otherwise I'd post it on Stack Overflow.)