File nautilus-default-thumbnail-size.diff of Package nautilus
--- nautilus-2.12.1.orig/libnautilus-private/nautilus-icon-factory.h 2005-05-23 08:21:47.000000000 -0500
+++ nautilus-2.12.1/libnautilus-private/nautilus-icon-factory.h 2005-11-16 18:11:57.000000000 -0600
@@ -72,7 +72,7 @@ typedef enum {
#define NAUTILUS_ICON_SIZE_LARGER 96
#define NAUTILUS_ICON_SIZE_LARGEST 192
-#define NAUTILUS_ICON_SIZE_THUMBNAIL 96
+#define NAUTILUS_ICON_SIZE_THUMBNAIL 64
/* Maximum size of an icon that the icon factory will ever produce */
#define NAUTILUS_ICON_MAXIMUM_SIZE 320