When I try to display .pdf file in browser (with proprietry extension .dnax) I get the error message "A plugin is needed to display this content".

I am trying to display a .pdf file within Firefox on a Vista PC. I have changed the extension from .pdf to .dnax to differentiate this .pdf file from others. I get an error message as above. The file is displayed using Firefox on another PC with a Linux OS without problem. Any advice out there?

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