[Bug 1945741]

[Infobob]

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.

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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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