When do you plan to support it?

It is limitation of PuTTY code. They believe that their format is more secure, so thay do not plan to support OpenSSH. However you can convert the key using PuTTYgen.

martin wrote:

If you mean that you cannot use OpenSSH key. Then, yes I'm sure.

When do you plan to support it?

Tom

Sure with what?
1) If you mean that you cannot use OpenSSH key. Then, yes I'm sure.
2) If you mean the the users should generate the key themselves. Then yes, I'm sure. The purpose of the private key is to be private. I.e. the user should generate it a never give it to anyone, including server administrator. Note that he/she may use the same key for several hosts, not only yours, so you should not know it. He/she only provides you public part of the key.

Are you sure !
I've already done it before upgrade openssh and winscp.

You cannot :-(
BTW: shouldn't users generate their private key themselves?

Hello,
How can i use an openssh private key directly with winscp (without using putty to convert my private key).
In fact, i'd like to have a linux script which create users and generate openssh private and public keys. I will only have to give private key to users.