Dirty errors with PHP popen()

[Snipey]

I call a file with popen():\[code\]$fp = @popen("/usr/bin/openssl ...");\[/code\]the specific details don't matter, but what happens here is that when I run the command I receive these errors on a Windows CMD:\[quote\] The system cannot find message text for message number 0x3 in the message file for System.\[/quote\]I know that the file don't exist on Windows, but why doesn't @ silence the errors? My library just tries a few different ways to achieve the same thing.