I think this is as easy as using the the ssh_cmd parameter: 
my $sftp = new Net::SFTP::Foreign(ssh_cmd => 'C:/path/to/putty.exe', h
+ost => ...);
...

[download]

In reply to Re: how can i use PuTTY under Net::SFTP::Foreign ? by pc88mxer
in thread how can i use PuTTY under Net::SFTP::Foreign ? by bulent_sahin

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