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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?

Yderligere systemdetaljer

Installerede plugins

  • Shockwave Flash 11.8 r800
  • Google Update
  • The QuickTime Plugin allows you to view a wide variety of multimedia content in Web pages. For more information, visit the QuickTime Web site.
  • 5.1.20513.0
  • Adobe PDF Plug-In For Firefox and Netscape 10.1.7
  • Next Generation Java Plug-in 10.21.2 for Mozilla browsers
  • Picasa plugin
  • Adobe Shockwave for Director Netscape plug-in, version
  • GEPlugin
  • CANON iMAGE GATEWAY Album Plugin Utility Module
  • Windows Presentation Foundation (WPF) plug-in for Mozilla browsers


  • User Agent: Mozilla/5.0 (Windows NT 6.0; rv:23.0) Gecko/20100101 Firefox/23.0

Yderligere information

  • Top 10 Contributor
2365 løsninger 20923 svar

Firefox typically judges the nature of a document or download based on the content-type header send by the web server. Usually a server has a catalog associating file extensions with content types. When you choose a new file extension, the server may send the generic "it's some kind of binary file" header ("application/octet-stream") which Firefox will not associate with a particular program.

Now, when you open a file from the local system, there is no web server, so Firefox may look to the file extension to ascertain the content type. Obviously that is not working in your case. What happens when you want to open the file from My Computer or Windows Explorer? Does Windows have an application assigned to it? If you can associate it with Adobe Reader in Windows, Firefox may be able to pick that up from the Windows registry.