diff -up blender/source/blender/blenkernel/intern/blender.c.cve blender/source/blender/blenkernel/intern/blender.c
--- blender/source/blender/blenkernel/intern/blender.c.cve	2008-05-07 17:37:52.000000000 +0200
+++ blender/source/blender/blenkernel/intern/blender.c	2008-05-07 17:38:22.000000000 +0200
@@ -716,7 +716,7 @@ void BKE_undo_save_quit(void)
 		
 	BLI_make_file_string("/", str, btempdir, "quit.blend");
 
-	file = open(str,O_BINARY+O_WRONLY+O_CREAT+O_TRUNC, 0666);
+	file = open(str,O_BINARY+O_WRONLY+O_CREAT+O_TRUNC+O_EXCL, 0666);
 	if(file == -1) {
 		error("Unable to save %s, check you have permissions", str);
 		return;