Could you expand on this statement? Do you mean that despite the header the browser might not open the open/save dialog at all, or do you mean that despite the user selecting "open" in the open/save dialog the browser might ignore that and just open the file anyway?
I have various download scripts that download Word, RTF, PDF, Excel, PowerPoint and CSV files using the disposition header to ~1,000 users with every brand and version of browser imaginable. In 3 years I've never received a complaint that the dialog didn't open or the file wouldn't save when instructed to, but if there's a particular configuration that's at risk, I'd love to read about it.
Forget that fear of gravity,
Get a little savagery in your life.
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