Index: classes/Download.php
===================================================================
--- classes/Download.php	(revision 706775)
+++ classes/Download.php	(working copy)
@@ -416,24 +416,24 @@
 		wp_die(__('Could not read file!', WPFB));
 		
 	$begin = 0;
-	$end = $size;
+	$end = $size - 1;
 
 	$http_range = isset($_SERVER['HTTP_RANGE']) ? $_SERVER['HTTP_RANGE'] : '';
 	if(!empty($http_range) && strpos($http_range, 'bytes=') !== false && strpos($http_range, ',') === false) // multi-range not supported (yet)!
 	{
 		$range = explode('-', trim(substr($http_range, 6)));
 		$begin = 0 + trim($range[0]);
-		if(!empty($range[1]))
+		if(is_numeric($range[1]))
 			$end = 0 + trim($range[1]);
 	} else
 		$http_range = '';
 	
-	if($begin > 0 || $end < $size)
+	if($begin > 0 || $end < ($size - 1))
 		header('HTTP/1.0 206 Partial Content');
 	else
 		header('HTTP/1.0 200 OK');
 		
-	$length = ($end-$begin);
+	$length = ($end - $begin + 1);
 	WPFB_Download::AddTraffic($length);
 	
 	
@@ -447,7 +447,7 @@
 	}
 	header("Content-Length: " . $length);
 	if(!empty($http_range))
-		header("Content-Range: bytes " . $begin . "-" . ($end-1) . "/" . $size);
+		header("Content-Range: bytes " . $begin . "-" . $end . "/" . $size);
 	
 	// clean up things that are not needed for download
 	@session_write_close(); // disable blocking of multiple downloads at the same time
@@ -483,9 +483,9 @@
 
 		$cur = $begin;
 		
-		while(!@feof($fh) && $cur < $end && @connection_status() == 0)
+		while(!@feof($fh) && $cur <= $end && @connection_status() == 0)
 		{		
-			$nbytes = min($buffer_size, $end-$cur);
+			$nbytes = min($buffer_size, $end - $cur + 1);
 			$ts = microtime(true);
 
 			print @fread($fh, $nbytes);
@@ -534,4 +534,4 @@
 	return array('error' => false, 'size' => $size);
 }
 
-}
\ No newline at end of file
+}