- /* Set to number of WIMs registered;
- * also the number of 'struct WimOverlay_dat_entry_2' that follow. */
- le32 num_entries_2;
-
- /* Set to 0 */
- le32 unknown_0x14;
+ /* The next available data source ID. This is tracked so that data
+ * source IDs are never reused, even if a WIM is unregistered. */
+ le64 next_data_source_id;