We're calling on all EU-based Mozillians with iOS or iPadOS devices to help us monitor Apple’s new browser choice screens. Join the effort to hold Big Tech to account!

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Firefox saving Adobe Acrobat Document as unknown file type

  • 3 odgovori
  • 1 ima ovaj problem
  • 16 views
  • Posljednji odgovor poslao cor-el

more options

I'm attempting to download files from a website. They appear to be PDF files, and with the Applications setting under Options set to use with Adobe Acrobat or preview with Firefox, it will open up as a PDF. However, if I try to directly save the file, it saves as an unknown file type.

I'm attempting to download files from a website. They appear to be PDF files, and with the Applications setting under Options set to use with Adobe Acrobat or preview with Firefox, it will open up as a PDF. However, if I try to directly save the file, it saves as an unknown file type.

All Replies (3)

more options

You will have to add the .pdf file extension yourself is Firefox leave this file extension blank to make Windows recognize the file as a PDF file.

Try rename/remove the handlers.json and remove the previously used mimeTypes.rdf file in the Firefox profile folder to reset all file actions.

You can use the button on the "Help -> Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the about:profiles page.

more options

Thank you for the response, I did remove the previous mimeTypes.rdf and handlers.json yesterday, which did reset all the actions in Applications.

Is there a way to edit either of those to have Firefox automatically append the ".pdf" suffix to the file when saving? The site in particular has a list of documents we are downloading and combining into one document for later viewing. I was attempting to find a "one click" solution to download, rather than having to open in the PDF previewer or Acrobat and "Saving as..." or having to rename each individual file after saving.

more options

If this still happens with a freshly created handlers.json file then it is more likely a problem with related Windows Registry keys (HKCR\.pdf or a linked MIME database key).

  • HKEY_CLASSES_ROOT\.pdf
  • HKEY_CLASSES_ROOT\MIME\Database\Content Type\