No Default Mail Client for paperport

PaperPort pro 14.5 stop working with a message that there is no mail client found.
I tried many fixes but nothing seems to work.
I have also repaired office
I am using gmail, msn and yahoo.
My default mail client is outlook 2016
Outlook is x64
Paperport is x86

Problem Solved in regedit:
HKEY_CURRENT_USER\software\scansoft\paperport\paperport user preference
Modify "Mozilla Firefox"

File, exit regedit

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