Cannot answer that one but I wonder if it is fixable through Adobe Acrobat, always assuming you use it. In the reader edit, preferences, internet there is a choice to Allow (or disallow) speculative downloading in the background. It does not sound as if its quite the thing but its worth a look.
When you normally put a small file on the web using the code in my first email, it will open in Browsers. When you put up a large file the Browser switches to download. However when the file is a pdf one and 10 Mb the browsers still want to open it. I presumably need to add some further code to that in my first email in order to force a download. But what?
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