PuTTY stores all sessions in Windows Registry, not in a file, so if you want to export these and import on some other computer or account then follow these steps (source):
- Press Win+R to run Registry Editor in Windows
- Type or paste the following (and hit Enter to confirm):
regedit /E "C:\Trash\PuTTY Settings.reg" HKEY_CURRENT_USER\Software\SimonTatham
Adjust path after
/E switch to match your expectations.
Execute the following (instead of above):
regedit /E "C:\Trash\PuTTY Sessions.reg" HKEY_CURRENT_USER\Software\SimonTatham\PuTTY\Sessions
if you wish to export just sessions, not the entire configuration of PuTTY.
Double click exported .reg file in order to import sessions or settings on a new computer.
Source: How to Export and Import Putty Settings (by TechEarl -May 27, 2018)