Every sysadmin who has been working for a while collects a considerable number of hosts in their PuTTy configuration. Ever wondered where PuTTY saves this list? Well, it’s not in a config file you could simply copy or move. Instead, PuTTy keeps it’s configuration in Windows registry.
Here’s a one liner which copies entire host list into a single .reg file:
regedit /e "%userprofile%\Desktop\putty.reg" HKEY_CURRENT_USER\Software\SimonTatham
Also please remember to copy your private keys (.ppk files) if you’ve used any.