Index: trunk/src/plug_io.c
===================================================================
--- trunk/src/plug_io.c	(revision 5342)
+++ trunk/src/plug_io.c	(revision 5343)
@@ -847,8 +847,10 @@
 	if (out->len == 0)
 		return 0;
 
-	for(n = 0; n < out->len; n++)
+	for(n = 0; n < out->len; n++) {
 		out->plug[n] = available[n].plug;
+		out->extension[n] = out->plug[n]->default_extension;
+	}
 
 	if (do_digest) {
 		for(n = 0; n < out->len; n++)
@@ -855,6 +857,7 @@
 			out->digest[n] = pcb_strdup_printf("%s (%s)", out->plug[n]->default_fmt, out->plug[n]->description);
 		out->digest[n] = NULL;
 	}
+
 	return out->len;
 }
 
Index: trunk/src/plug_io.h
===================================================================
--- trunk/src/plug_io.h	(revision 5342)
+++ trunk/src/plug_io.h	(revision 5343)
@@ -84,6 +84,7 @@
 
 	const char *default_fmt;
 	const char *description;
+	const char *default_extension; /* used to generate save-as filename */
 
 	int save_preference_prio; /* all available save plugins are sorted by this before presenting them to the user to choose one */
 };
@@ -130,7 +131,8 @@
 typedef struct {
 	int len;
 	const pcb_plug_io_t *plug[PCB_IO_MAX_FORMATS+1];
-	char *digest[PCB_IO_MAX_FORMATS+1];           /* string that contains the format identifier and the description */
+	char *digest[PCB_IO_MAX_FORMATS+1];           /* string that contains the format identifier and the description (strdup'd) */
+	const char *extension[PCB_IO_MAX_FORMATS+1];  /* default file extension, with the leading . (not strdup'd) */
 } pcb_io_formats_t;
 
 /* Search all io plugins to see if typ/wr is supported. Return an ordered