Quick question, -is there a maximum filesize that open() can cope with?

I am trying to open and readline() from a 66MB file and the first time I readline() it's coming back with an @ERROR code of -1 meaning end of file reached.

this is my code:



Code:
 BREAK ON
	
	$x = open(3, "\\skynet\Safe\_index\gd.txt")
	? "Open file " + $x
	$line = readline(3)
	? "First read: " + @ERROR
	while @ERROR = 0
		? $line
		$line = readline(3)
	loop
	? "Done"
	$x = close(3)