[Bug 1945741]

[Wls220spring]

(In reply to BOB from comment #33)
> I just upgraded to 91.3.1  from 91.3.0 and when composing an email I still can't open an attached PDF file to confirm I am sending the correct attachment. I thought I read that acknowledged bug was fixed in 91.3.1 ?
> 
> Error message is: C:\Users\BOB MAIN\Documents\BELMOON-RPT-1.PDF could not be opened, because the associated helper application does not exist. Change the association in your preferences.
> 
> Thank you.

Your helper application is "Preview in Thunderbird" for "Portable
Document Type (PDF)"?

That is what this bug report is about, and verified again using the
91.3.1 release on Windows 10 and Fedora Linux.

Your issue is bug 1698140.

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https://bugs.launchpad.net/bugs/1945741

Title:
  [upstream] PDF attachment opens in Firefox instead of the built-in
  viewer when opened from the compose window

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