If you force a user to save the file locally instead of opening it in the
manner in which their browser is set up to handle it you're taking away their
control of default behaviours. I really recommend against this. Let the browser
handle it. If they have only the Acrobat Reader, a PDF
will (generally) open within the browser. If they want to set it up
differently to open in Acrobat itself, they can change their setup.
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How many users out there do you know that actually know
they can change these settings? Let alone know how to change these
settings.
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I have all these types of
things set as I want them. I want to open Word and Excel files within the
browser. If you force me to save it you're taking my preference away and I get
really cranky. Then I have to remember where I saved it and clean it up later,
rather than it being a temporary internet file that is purged
automatically.
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Forcing to save ALSO gives you the option to open, OK
it does not open it in your browser, but in the program it was intended to open
in the first place (outside your browser)..
I think no matter what preferences the user has set in their
browser, we should do a bit of thinking for them, who actually has no problems
opening up a PDF or word document in their browser?
my 2
pesetas