I have added this issue to the tracker:
Issue 2206 – Improve OpenSSH config file parsing, particularly quoted and escaped values

Can you send me an email, so I can send you back a development version of WinSCP for testing? Please include a link back to this topic in your email. Also note in this topic that you have sent the email. Thanks.

Thanks for your report. I'll look into it.

Hello,

when importing sites from OpenSSH (%userprofile%\.ssh\config) to WinSCP there is an issue with quotes. If particular config line has username placed between double quotes (for example - User "msmucr"), which is valid in OpenSSH config syntax, then imported profile WinSCP has incorrect username with literal quotes around.
It's a detail, but if you can strip those quotes during import, it will be great.
I'm using the latest current version – 6.1.1

Thank you very much for WinSCP!

Michal Smucr