CreateProcessW failed error:2 posix_spawn: No such file or directory 解决

Found out to be a problem with the Windows openSSH package.
In ProxyCommands, it asks for the full path qualifier, but it's better to use forward slashes here!
so changed to

Host of15
    HostName 123.125.47.xxx
    Port 1615
    User lixiang
    IdentityFile C:\Users\MyPC\Desktop\lixiang\id_rsa

Host of16
    HostName 192.168.1.xx
    User lixiang
    ProxyCommand C:/Windows/System32/OpenSSH/ssh.exe -W %h:%p of15

StrictHostKeyChecking no
UserKnownHostsFile /dev/null