fpdf not using specified filename in "Save As..." dialogue after Acrobat upgrade

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Using the string:

$pdf->Output("testfile.pdf", I);

the "Save As..." dialogue box does not provide the specified filename.
The default is the name of the PHP page used to generate the PDF.

It worked when using Acrobat 4.0 and since upgrading to 6.0, it no
longer works.

The "D" and "F" switches do parse the correct filename.

Problem exists in both Netscape and IE.

Anyone else experience this and is there a resolution?

Thanks in advance.

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