How can I print HTML files to a specified printer using shellexecute?

I have an application that has records that can have a number of attachments associated to them, which may be a collection of JPG, TIF, PDF or HTM files (theoretically this list is arbitrary, and these are the most typical types).

One of the actions I need to be able to do is to allow these to be printed en mass to a specific printer.

For most file types, I can emulate the shell and perform the same action as had they dragged the file and dropped it onto a printer in explorer, by using the "PrintTo" verb, and using ShellExecute (via ProcessStartInfo); however, I've been scratching my head for a while wondering why this wasn't working for HTM files - instead it always prompts to select a printer for each file, even though the registry settings appear to be there for it.

It is when I went back to first principles, and checked to see if the shell behaves "properly" when I discovered that it behaves the same way (so, lets say you drag and开发者_如何转开发 drop any old HTML file onto a printer in explorer, it always prompts to print, defaulting the printer to be your default printer, even if that isn't the printer you dropped the file onto)

Now, it appears this behaviour was introduced in IE7 (whether intentionally, or not, I'm unsure); but is there any way of getting this to work as expected?

EDIT: This is for an internal application, so it would be permissible to fix up the registry if that would work.

You could use the webbrowser control and call the .Print() method. I just tested it and it went right to my default printer without prompting me. I know that might not be ideal, but I think it should get the job done.