From time to time we need migrate our putty configuration/sessions that we saved (configurations, IPs etc).
Putty store those data inside system register and those are some methods to extract them and save to new pc:
# cmd
regedit /e "%USERPROFILE%\Desktop\putty.reg" HKEY_CURRENT_USER\Software\SimonTatham
# powershell
reg export HKCU\Software\SimonTatham ([Environment]::GetFolderPath("Desktop") + "\putty.reg")
# regedit
HKEY_CURRENT_USER -> Software -> SimonTatham -> PuTTY
We end up with putty.reg on our Desktop which we can execute on new computer and enjoy with same settings/sessions as before.