Index: lib/filelib.php
===================================================================
RCS file: /cvsroot/moodle/moodle/lib/filelib.php,v
retrieving revision 1.30.2.3
diff -u -r1.30.2.3 filelib.php
--- lib/filelib.php	6 Jan 2007 15:24:14 -0000	1.30.2.3
+++ lib/filelib.php	1 Feb 2007 13:42:42 -0000
@@ -223,6 +223,11 @@
 function send_file($path, $filename, $lifetime=86400 , $filter=0, $pathisstring=false, $forcedownload=false, $mimetype='') {
     global $CFG;
 
+	// On IE, zip files get truncated when you try to read then inline
+	if ($mimetype == 'application/zip' or mimeinfo('type', $filename) == 'application/zip') { 
+		$forcedownload = true;
+	}
+	
     // Use given MIME type if specified, otherwise guess it using mimeinfo.
     // IE, Konqueror and Opera open html file directly in browser from web even when directed to save it to disk :-O
     // only Firefox saves all files locally before opening when content-disposition: attachment stated