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Issue 1682 – Support OpenSSH ssh-agent

: Core
: Unspecified
: Enhancement
: Low
: NEW
:
Though it's more likely to get implemented, if you ask PuTTY team to implement it, rather than here.
https://www.chiark.greenend.org.uk/~sgtatham/putty/feedback.html
Here is a proxy agent that allows WinSCP talking to OpenSSH agent:
https://github.com/ndbeals/winssh-pageant
Use with caution.
The version of Pageant included since WinSCP 5.20.4 can talk to OpenSSH.
So while you still cannot use WinSCP/PuTTY with OpenSSH agent, you can use Pageant instead for OpenSSH, PuTTY and WinSCP.
https://winscp.net/eng/docs/ui_pageant#openssh
https://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/win-pageant-openssh-interop.html