Howto use pagent functionality of PuTTYTray for PuTTY 0.71 or alternatives?

[Reiner030]

Since there are several security updates/risk to use the outdated PuTTYTray it would be still nice to have the feature of confirming key usage offered by PuTTYTray pagent functionality which seems not to be implemented in any other alternatives.

I tried to call the renamed PuTTYTray executable as e.g. puttytray.exe and pagent.exe but it seems not running with these names?
Is there some hook/hint that's needs to be respect or did I something wrong (e.g. needed restart of windows, deactivating the also running gpg-agent which normally causes no problems, ...) ?
Thanks.