How to export PUTTY settings?

Export:
cmd.exe (elevated command prompt)

Only sessions:
(two rows in one):

regedit /e "%USERPROFILE%\Desktop\putty-sessions.reg" KEY_CURRENT_USER\Software\SimonTatham\PuTTY\Sessions

All settings:
(two rows in one):

regedit /e "%USERPROFILE%\Desktop\putty.reg" HKEY_CURRENT_USER\Software\SimonTatham

Save the .reg file.

(On the target system doble click on .reg file and import settings.)

Source (e.g.)
stackoverflow.com