Content-disposition being ignored in IE 9 and Firefox 13
===

I am trying to dynamically create an inline PDF that, when the user chooses to save it, prompts with my custom filename. According to [the documentation](http://help.adobe.com/en_US/ColdFusion/9.0/CFMLRef/WSc3ff6d0ea77859461172e0811cbec22c24-7c21.html), the `saveasname` attribute should do what I want.

> (format="PDF" only) The filename that appears in the SaveAs dialog when a user saves a PDF file written to the browser.

However, what is happening in both IE 9 and in Firefox 13.0.1 is that the filename that appears in the SaveAs dialog is the same as my CF template, but with a PDF extension. (In other words, my code is in `makepdf.cfm` and the SaveAs prompts me to save `makepdf.pdf`.) In Chrome, however, it works perfectly. (All on Windows 7.)

Here is my code to create the PDF:

    <cfdocument format="pdf" bookmark="true" saveasname="MyReport.pdf">


If I explicitly declare the content disposition and content type, like so

    <cfheader name="Content-Disposition" value="inline; filename=MyReport.pdf">
    <cfcontent type="application/x-pdf">
    <cfdocument format="pdf" bookmark="true" saveasname="MyReport.pdf">

* Chrome tells me that "Content-Disposition" has been declared twice
* Firefox tells me the PDF file is corrupt
* IE just ignores it (and still doesn't show the right filename)


If I just rely on the header

    <cfheader name="Content-Disposition" value="inline; filename=MyReport.pdf">
    <cfcontent type="application/x-pdf">
    <cfdocument format="pdf" bookmark="true">

I get the same behavior as the first snippet of code.

I know how to get the browser to prompt for download rather than displaying inline, and everything works as expected then, but that's not the desired behavior.

I need to use times and dates in filenames and the end users are not savvy enough to keep from overwriting their files (should they choose to save them).

Is there something I'm missing that will get IE and Firefox to do what they're supposed to? What other browsers are going to do this? Mobile Safari?