I am running Win 7 64-bit and Firefox 31. Just lately, downloaded and internally generated PDFs show up with the correct thumbnail, and they open in Acrobat when clicked, but the description in Opus shows Firefox HTML document. If I go to Settings/File Types/PDF I can change the description to Adobe Acrobat Document, but it doesn't stick.
In Windows Explorer, the files show up correctly described as Adobe Acrobat Document.
Help please.
Please run FileTypeDIag on the PDF extension and attach the txt file it generates.
Txt file attached.
pdf.txt (181 KB)
Thanks!
These look like the key parts of the output:
[code]64 HKCR.pdf
64 HKCR.pdf: "" is REG_SZ: "FirefoxHTML"
64 HKCR\FirefoxHTML
64 HKCR\FirefoxHTML: "" is REG_SZ: "Adobe Acrobat Document"
64 HKCR\FirefoxHTML: "FriendlyTypeName" is REG_SZ: "Firefox HTML Document"
64 HKCR\FirefoxHTML\DefaultIcon: "" is REG_SZ: "D:\Program Files (x86)\Mozilla Firefox 30\firefox.exe,1"
64 HKCR\FirefoxHTML\shell\open\command: "" is REG_SZ: ""D:\Program Files (x86)\Mozilla Firefox 30\firefox.exe" -osint -url "%1""
64 HKCR\FirefoxHTML\shell\Edit\command: "" is REG_SZ: ""D:\Program Files (x86)\Microsoft Office\Office12\msohtmed.exe" %1"
64 HKCR\FirefoxHTML\shell\Print\command: "" is REG_SZ: ""D:\Program Files (x86)\Microsoft Office\Office12\msohtmed.exe" /p %1"
64 HKCU\Software\Classes\FirefoxHTML: "" is REG_SZ: "Adobe Acrobat Document"
64 HKLM\Software\Classes\FirefoxHTML: "" is REG_SZ: "Firefox HTML Document"[/code]
So something really has assigned the .PDF extension to the FirefoxHTML file type on your machine. That's obviously incorrect.
When you edited the name, you will have edited the FirefoxHTML type's name, which isn't really what you'd want as it will probably also affect your .HTML files (unless they're pointing at another type). It looks like the FriendlyTypeName (which wasn't edited) is being used in some cases, while the other one is used in others, which explains the mismatch in names. But the underlying problem is that the .PDF extension is pointing to the wrong file type in the first place.
To fix that you'll need to edit the registry, or possibly install some well-written PDF-related software (if there is any 
) which might repair the file type.
Which type the .PDF extension needs to be assigned to will depend on which software you have installed, so I can't say what you'll need to set it to. I would first try reinstalling or doing a repair install on your PDF viewer of choice to see if that repairs things.
Thanks for this. It's all very strange because any PDF shows up as an Adobe Acrobat Document in Windows Explorer and even in Opus where it shows as a Firefox document, it opens perfectly normally with a double click in Acrobat Pro or Reader. I think I'll leave well alane and live with it in Opus, it may well sort it self out at some stage, after all it appeared out of the blue so maybe it will go away just as suddenly.
Thanks for your help and prompt replies.