Opening unknown mimetype with Adobe Reader in firefox?

Firefox 4.0 appears to be able to identify an unknown mimetype with a pdf file. In Options>Applications>Content Type, it lists "PDF (application/unknown)" as a content type but I cannot alter it so that this file type will open with "Use Adobe Reader (in Firefox)." Is there anyway to fix this so that Reader will open these files in firefox?

I see. Can you provide an URL where it does not open through the plugin as expected? HTTP (web) servers are responsible for asserting the MIME type of the content in reponse to the user-agent (browser). If the server does not define the MIME type as being "application/pdf" before proceeding to serve the content then the plug-in will not kick in. That's one possible tangent.
The other is that something is wrong in Firefox. In that case, try [http://kb.mozillazine.org/File_types_and_download_actions#Resetting_download_actions resetting the download actions].

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In article <[email protected]>, Jhpoot wrote:
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>
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"1. Generate a new PDF and a FDF file. Try opening the same and see if it behaves the same way."
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Opening unknown mimetype with Adobe Reader in firefox?

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