error 453 with some wininet commands

Hello everyone...
I'm using window api winint with some functions like InternetOpen, InternetConnect, FtpGetFile and they all works. But with some other commands like ftpcommand, internetgetconnectedstate or ftpgetfilesize i get error code 453 unable to find
that command in wininet.

Why???????

Thanks

Could be a lot of things: declarations, corrupt dll, etc.

Start here. Search for 'wininet'
There is sample code: 'FTP: Downloading Files via FTP' and one on FTP file listings which cover all of what you need.