Hi, I first got this error on PHP 4.0.1pl2, then on PHP 4.0.2.

Something simple like this:

$command = "mycommand.exe";
$output = system(EscapeShellCmd($command));
print ("<pre>$output</pre>");

Will result in an error like:
Warning: Unable to fork [mycommand.exe] in D:\docs\myscript.php on line 31

I'm running Windows 2000 Professional with IIS.

PHP is running in ISAPI mode.

Thanks in advance!