Please answer the following

"OpenSSH for Windows" version
((Get-Item (Get-Command sshd).Source).VersionInfo.FileVersion)
tested with versions 0.0.23.0 and 0.0.18.0

Server OperatingSystem
((Get-ItemProperty "HKLM:\SOFTWARE\Microsoft\Windows nt\CurrentVersion\" -Name ProductName).ProductName)
any server on any OS - it's a client issue (tested against various servers, both Linux and sshd on localhost running on Win7 SP1 Ultimate)

Client OperatingSystem
Windows 7 SP1 Ultimate

What is failing
On Windows 7, I can't connect to any ssh server using the ssh.exe client from this project. The servers that I've tested all have password auth. The key error message is: ssh_askpass: fork: No such file or directory.

On Windows 10 (tested with Win10-1709) and on Windows 8.1, the same ssh.exe binary works as expected (connections against the same servers).
On the Windows 7 host, the same connections work using a different ssh client (i.e. putty).
Same effect both with the 32bit and 64 bit ssh.exe.

I have tried ssh.exe both in version 0.0.23.0 and 0.0.18.0 (the version that ships as capability/optional feature in Win10-1709) without success.

Expected output

> ssh.exe [email protected]
[email protected]'s password:
NetBSD 7.1 (GENERIC.201703111743Z)

     *    . @%@%@%@%@%@%@ (    )
     (      {   happy   }  \  (   *
      ) *   { birthday! }   )    (
     (    @%@%@%@%@%@%@%@%@       ) '
   +      {    SDF 30!    }  *   (
          {  1987 - 2017  }    .    )
    jgs   {    June 16    }        (
  *      @%@%@%@%@%@%@%@%@%@    +

Actual output

> ssh.exe [email protected]
key_load_public: invalid format
ssh_askpass: fork: No such file or directory
Host key verification failed.
PS C:\Windows\System32\WindowsPowerShell\v1.0>