--- a/config.c	Sun Nov 26 17:33:39 2017 -0800
+++ b/config.c	Sun Nov 26 18:33:36 2017 -0800
@@ -155,3 +155,23 @@
 	//this will never get reached, but the compiler doesn't know that. Let's make it happy
 	return NULL;
 }
+
+char **get_extension_list(tern_node *config, uint32_t *num_exts_out)
+{
+	char *ext_filter = strdup(tern_find_path_default(config, "ui\0extensions\0", (tern_val){.ptrval = "bin gen md smd sms gg"}, TVAL_PTR).ptrval);
+	uint32_t num_exts = 0, ext_storage = 5;
+	char **ext_list = malloc(sizeof(char *) * ext_storage);
+	char *cur_filter = ext_filter;
+	while (*cur_filter)
+	{
+		if (num_exts == ext_storage) {
+			ext_storage *= 2;
+			ext_list = realloc(ext_list, sizeof(char *) * ext_storage);
+		}
+		ext_list[num_exts++] = cur_filter;
+		cur_filter = split_keyval(cur_filter);
+	}
+	free(ext_filter);
+	*num_exts_out = num_exts;
+	return ext_list;
+}

--- a/config.h	Sun Nov 26 17:33:39 2017 -0800
+++ b/config.h	Sun Nov 26 18:33:36 2017 -0800
@@ -10,6 +10,7 @@
 tern_node *parse_config_file(char *config_path);
 tern_node *parse_bundled_config(char *config_name);
 tern_node *load_config();
+char **get_extension_list(tern_node *config, uint32_t *num_exts_out);
 
 #endif //CONFIG_H_
 

--- a/menu.c	Sun Nov 26 17:33:39 2017 -0800
+++ b/menu.c	Sun Nov 26 18:33:36 2017 -0800
@@ -10,6 +10,7 @@
 #include "gst.h"
 #include "paths.h"
 #include "saves.h"
+#include "config.h"
 
 static menu_context *get_menu(genesis_context *gen)
 {
@@ -166,40 +167,17 @@
 				dst = copy_dir_entry_to_guest(dst, m68k, "..", 1);
 			}
 #endif
-			char *ext_filter = strdup(tern_find_path_default(config, "ui\0extensions\0", (tern_val){.ptrval = "bin gen md smd sms gg"}, TVAL_PTR).ptrval);
-			uint32_t num_exts = 0, ext_storage = 5;
-			char **ext_list = malloc(sizeof(char *) * ext_storage);
-			char *cur_filter = ext_filter;
-			while (*cur_filter)
-			{
-				if (num_exts == ext_storage) {
-					ext_storage *= 2;
-					ext_list = realloc(ext_list, sizeof(char *) * ext_storage);
-				}
-				ext_list[num_exts++] = cur_filter;
-				cur_filter = split_keyval(cur_filter);
-			}
+			uint32_t num_exts;
+			char **ext_list = get_extension_list(config, &num_exts);
 			for (size_t i = 0; dst && i < num_entries; i++)
 			{
 				if (num_exts && !entries[i].is_dir) {
-					char *ext = path_extension(entries[i].name);
-					if (!ext) {
-						continue;
-					}
-					uint32_t extidx;
-					for (extidx = 0; extidx < num_exts; extidx++)
-					{
-						if (!strcasecmp(ext, ext_list[extidx])) {
-							break;
-						}
-					}
-					if (extidx == num_exts) {
+					if (!path_matches_extensions(entries[i].name, ext_list, num_exts)) {
 						continue;
 					}
 				}
 				dst = copy_dir_entry_to_guest(dst,  m68k, entries[i].name, entries[i].is_dir);
 			}
-			free(ext_filter);
 			free(ext_list);
 			//terminate list
 			uint8_t *dest = get_native_pointer(dst, (void **)m68k->mem_pointers, &m68k->options->gen);

--- a/nuklear_ui/blastem_nuklear.c	Sun Nov 26 17:33:39 2017 -0800
+++ b/nuklear_ui/blastem_nuklear.c	Sun Nov 26 18:33:36 2017 -0800
@@ -10,6 +10,7 @@
 #include "../paths.h"
 #include "../saves.h"
 #include "../blastem.h"
+#include "../config.h"
 
 static struct nk_context *context;
 
@@ -28,6 +29,9 @@
 	static dir_entry *entries;
 	static size_t num_entries;
 	static uint32_t selected_entry;
+	static char **ext_list;
+	static uint32_t num_exts;
+	static uint8_t got_ext_list;
 	if (!current_path) {
 		get_initial_browse_path(&current_path);
 	}
@@ -37,6 +41,10 @@
 			sort_dir_list(entries, num_entries);
 		}
 	}
+	if (!got_ext_list) {
+		ext_list = get_extension_list(config, &num_exts);
+		got_ext_list = 1;
+	}
 	uint32_t width = render_width();
 	uint32_t height = render_height();
 	if (nk_begin(context, "Load ROM", nk_rect(0, 0, width, height), 0)) {
@@ -45,6 +53,12 @@
 			nk_layout_row_static(context, 28, width-100, 1);
 			for (uint32_t i = 0; i < num_entries; i++)
 			{
+				if (entries[i].name[0] == '.' && entries[i].name[1] != '.') {
+					continue;
+				}
+				if (num_exts && !entries[i].is_dir && !path_matches_extensions(entries[i].name, ext_list, num_exts)) {
+					continue;
+				}
 				int selected = i == selected_entry;
 				nk_selectable_label(context, entries[i].name, NK_TEXT_ALIGN_LEFT, &selected);
 				if (selected) {

--- a/util.c	Sun Nov 26 17:33:39 2017 -0800
+++ b/util.c	Sun Nov 26 18:33:36 2017 -0800
@@ -270,6 +270,22 @@
 	return strdup(lastdot+1);
 }
 
+uint8_t path_matches_extensions(char *path, char **ext_list, uint32_t num_exts)
+{
+	char *ext = path_extension(path);
+	if (!ext) {
+		return 0;
+	}
+	uint32_t extidx;
+	for (extidx = 0; extidx < num_exts; extidx++)
+	{
+		if (!strcasecmp(ext, ext_list[extidx])) {
+			return 1;
+		}
+	}
+	return 0;
+}
+
 char * path_dirname(char *path)
 {
 	char *lastslash = NULL;

--- a/util.h	Sun Nov 26 17:33:39 2017 -0800
+++ b/util.h	Sun Nov 26 18:33:36 2017 -0800
@@ -42,6 +42,8 @@
 char * basename_no_extension(char *path);
 //Returns the extension from a path or NULL if there is no extension
 char *path_extension(char *path);
+//Returns true if the given path matches one of the extensions in the list
+uint8_t path_matches_extensions(char *path, char **ext_list, uint32_t num_exts);
 //Returns the directory portion of a path or NULL if there is no directory part
 char *path_dirname(char *path);
 //Gets the smallest power of two that is >= a certain value, won't work for values > 0x80000000