OpenSSH Keys and Putty

[Jon]

Is it possible for putty or ssh.com's windows SSH client to use OpenSSH
generated private keys?

Basically, I generated a public/private key set on my main workstation at
home and I installed it on all my machines, and it works great.  However,
when I brought the key to work and tried to use it on a windows box
both putty and commercial SSH report that they can not read the private key
file.  

I tried using 'ssh-keygen -e -f id_rsa' and I still couldn't get it
going.  

I'd really like to turn off ssh password authentication on my firewall. :)

Jon