Copy of 4GB+ files failes with PHP on Windows even if FS is NTFS and PHP is 64 bit.

trycopy.php

<?php
	//Both files must be on an NTFS volume. You may use the same volume.
	$src='C:/temp/long.bin';
	$dst='D:/temp/long.bin';
	define('SIZE_4G',0x100000000);

	//Create large file with mostly zeros but random content at the end
	function create_file($src){
		@unlink($src);
		echo 'Creating sparse via fsutil...';
		exec('fsutil file createnew ' . escapeshellarg($src) . ' ' . (SIZE_4G-0x100));
		echo ' OK' . PHP_EOL;
		echo 'Appending some random bytes...';
		if($fp=fopen($src,'ab')){
			fwrite($fp,random_bytes(0x200));
			fclose($fp);
			echo ' OK' . PHP_EOL;
			return TRUE;
		}
		echo ' FAIL' . PHP_EOL;
		return FALSE;
	}

	//Copy using copy()
	function copy_1($src,$dst){
		!file_exists($dst) or unlink($dst) or die('dst in use?');
		copy($src,$dst);
	}
	//Copy using stream_copy_to_stream()
	function copy_2($src,$dst){
		!file_exists($dst) or unlink($dst) or die('dst in use?');
		$f1=fopen($src,'rb') or die('src open failed');
		$f2=fopen($dst,'wb') or die('dst open failed');
		stream_copy_to_stream($f1,$f2);
		fclose($f1);
		fclose($f2);
	}
	//Copy manually
	function copy_3($src,$dst){
		!file_exists($dst) or unlink($dst) or die('dst in use?');
		$f1=fopen($src,'rb') or die('src open failed');
		$f2=fopen($dst,'wb') or die('dst open failed');

		while(!feof($f1)){
			fwrite($f2,fread($f1,1024*1024*100));
			echo '.';
		}
		fclose($f1);
		fclose($f2);
	}
	//Verify contents
	function verify($src,$dst){
		$buffer=1024*1024*100;
		if(filesize($src)!==filesize($dst)){
			echo 'Files have different sizes!' . PHP_EOL;
			return FALSE;
		}
		$f1=fopen($src,'rb') or die('src open failed');
		$f2=fopen($dst,'rb') or die('dst open failed');
		//Seek to 4 GB boundary, as this is the location where the problem occurs
		fseek($f1,SIZE_4G-0x100,SEEK_SET);
		fseek($f2,SIZE_4G-0x100,SEEK_SET);
		$identical=fread($f1,0x200)===fread($f2,0x200);
		if(!$identical){
			echo 'Files have different contents across 4GB boundary!' . PHP_EOL;
		}
		else{
			echo 'Files OK' . PHP_EOL;
		}
		fclose($f1);
		fclose($f2);
		return $identical;
	}

	!file_exists($dst) or unlink($dst) or die('dst in use?');
	echo 'Creating very large file' . PHP_EOL;
	create_file($src) or die('create failed');
	echo 'File created. Size: ' . filesize($src) . ' bytes' . PHP_EOL;

	echo 'Duplicate file using copy()...';
	copy_1($src,$dst);
	echo ' Done' . PHP_EOL;
	verify($src,$dst);

	echo 'Duplicate file using stream_copy_to_stream()...';
	copy_2($src,$dst);
	echo ' Done' . PHP_EOL;
	verify($src,$dst);

	echo 'Duplicate file using fread() and fwrite()...';
	copy_3($src,$dst);
	echo ' Done' . PHP_EOL;
	verify($src,$dst);

	echo 'Done' . PHP_EOL;
	echo 'PHP: ' . phpversion() . PHP_EOL;
	echo 'Is x64: ' . (PHP_INT_MAX>0xFFFFFFFF?'Y':'N') . PHP_EOL;
	echo 'OS: ' . php_uname();