Index: mucs.c
===================================================================
--- mucs.c	(revision 23713)
+++ mucs.c	(revision 23714)
@@ -76,7 +76,7 @@
 		fname = pcb_gui->fileselect("Load mucs routing session Resource File...",
 																"Picks a mucs session resource file to load.\n"
 																	"This file could be generated by mucs-pcb\n",
-																default_file, ".l1", "unixplot", PCB_HID_FSD_READ, NULL);
+																default_file, ".l1", NULL, "unixplot", PCB_HID_FSD_READ, NULL);
 		if (fname == NULL) {
 			PCB_ACT_IRES(1);
 			return 0;