This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Avatar for Username

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

This thread was archived. Please ask a new question if you need help.

pdf could not be opened, because the associated helper application does not exist. Change the association in your preferences.

  • 1 reply
  • 1 has this problem
  • 47 views
  • Last reply by Toad-Hall

J M
J M
more options

error message when trying to view attachment in draft email

'pdf could not be opened, because the associated helper application does not exist. Change the association in your preferences.'

error message when trying to view attachment in draft email ''''pdf could not be opened, because the associated helper application does not exist. Change the association in your preferences.''''

All Replies (1)

Toad-Hall
Toad-Hall
  • Top 10 Contributor
more options

Menu app icon > 'Preferences' > 'General' 'Files & Attachments' section Content Type: HTML Document - What is set up as the Action ? Content Type : PDF - What is set up as the Action ?

Try setting the following, restart Thunderbird and report on what occurs. Content Type: "HTML Document" Action is usually a browser - "Use Firefox Web Browser (default)", changed it to "Always Ask" Content type: "Portable Document Format (PDF)" set Action : "Preview in Thunderbird"

Modified by Toad-Hall