diff --git a/apps/plugins/viewer.c b/apps/plugins/viewer.c
index a726a4b..02c0ae3 100755
--- a/apps/plugins/viewer.c
+++ b/apps/plugins/viewer.c
@@ -25,6 +25,36 @@
 
 PLUGIN_HEADER
 
+/* global settings file
+ * binary file, so dont use .cfg
+ *
+ * setting file format
+ *
+ * part                byte count
+ * --------------------------------
+ * 'TVGS'               4
+ * version              1
+ * word_mode            1
+ * line_mode            1
+ * view_mode            1
+ * encoding             1
+ * scrollbar_mode       1
+ * need_scrollbar       1
+ * page_mode            1
+ * page_number_mode     1
+ * title_mode           1
+ * scroll_mode          1
+ * autoscroll_speed     1
+ * font name            MAX_PATH
+ */
+#define GLOBAL_SETTINGS_FILE     VIEWERS_DIR "/viewer.dat"
+
+/* temporary file */
+#define GLOBAL_SETTINGS_TMP_FILE VIEWERS_DIR "/viewer_file.tmp"
+
+#define GLOBAL_SETTINGS_HEADER   "\x54\x56\x47\x53\x31" /* header="TVGS" version=1 */
+#define GLOBAL_SETTINGS_H_SIZE   5
+
 /* preferences and bookmarks at each file
  * binary file, so dont use .cfg
  *
@@ -1831,6 +1861,46 @@ static bool viewer_write_bookmark_infos(int bfd)
     return true;
 }
 
+static bool viewer_load_global_settings(void)
+{
+    unsigned buf[GLOBAL_SETTINGS_H_SIZE];
+    int sfd = rb->open(GLOBAL_SETTINGS_FILE, O_RDONLY);
+
+    if (sfd < 0)
+        return false;
+
+    if ((rb->read(sfd, buf, GLOBAL_SETTINGS_H_SIZE) != GLOBAL_SETTINGS_H_SIZE) ||
+        rb->memcmp(buf, GLOBAL_SETTINGS_HEADER, GLOBAL_SETTINGS_H_SIZE) ||
+        !viewer_read_preferences(sfd))
+     {
+        rb->close(sfd);
+        return false;
+    }
+    rb->close(sfd);
+    return true;
+}
+
+static bool viewer_save_global_settings(void)
+{
+    int sfd = rb->open(GLOBAL_SETTINGS_TMP_FILE, O_WRONLY|O_CREAT|O_TRUNC);
+
+    if (sfd < 0)
+         return false;
+
+    if (rb->write(sfd, &GLOBAL_SETTINGS_HEADER, GLOBAL_SETTINGS_H_SIZE)
+        != GLOBAL_SETTINGS_H_SIZE ||
+        !viewer_write_preferences(sfd))
+    {
+        rb->close(sfd);
+        rb->remove(GLOBAL_SETTINGS_TMP_FILE);
+        return false;
+    }
+    rb->close(sfd);
+    rb->remove(GLOBAL_SETTINGS_FILE);
+    rb->rename(GLOBAL_SETTINGS_TMP_FILE, GLOBAL_SETTINGS_FILE);
+    return true;
+}
+
 static void viewer_load_settings(void)
 {
     unsigned char buf[MAX_PATH+2];
@@ -1881,8 +1951,9 @@ static void viewer_load_settings(void)
 read_end:
     if (!res)
     {
-        /* set default preference */
-        viewer_default_preferences();
+        /* load global settings */
+        if (!viewer_load_global_settings())
+            viewer_default_preferences();
 
         file_pos = 0;
         screen_top_ptr = buffer;
@@ -2464,7 +2535,7 @@ MAKE_MENU(option_menu, "Viewer Options", NULL, Icon_NOICON,
 #endif
             &scroll_mode_item, &autoscroll_speed_item);
 
-static bool viewer_options_menu(void)
+static bool viewer_options_menu(bool is_global)
 {
     bool result;
     struct preferences tmp_prefs;
@@ -2473,7 +2544,7 @@ static bool viewer_options_menu(void)
 
     result = (rb->do_menu(&option_menu, NULL, NULL, false) == MENU_ATTACHED_USB);
 
-    if (rb->memcmp(&tmp_prefs, &prefs, sizeof(struct preferences)))
+    if (!is_global && rb->memcmp(&tmp_prefs, &prefs, sizeof(struct preferences)))
     {
         if (rb->strcmp(prefs.font, sys_font))
             set_font(prefs.font);
@@ -2499,7 +2570,7 @@ static void viewer_menu(void)
     MENUITEM_STRINGLIST(menu, "Viewer Menu", NULL,
                         "Return", "Viewer Options",
                         "Show Playback Menu", "Select Bookmark",
-                        "Quit");
+                        "Global Settings", "Quit");
 
     result = rb->do_menu(&menu, NULL, NULL, false);
     switch (result)
@@ -2507,7 +2578,7 @@ static void viewer_menu(void)
         case 0: /* return */
             break;
         case 1: /* change settings */
-            done = viewer_options_menu();
+            done = viewer_options_menu(false);
             break;
         case 2: /* playback control */
             playback_control(NULL);
@@ -2519,7 +2590,19 @@ static void viewer_menu(void)
             if (prefs.scroll_mode == PAGE && cline > 1)
                 viewer_scroll_to_top_line();
             break;
-        case 4: /* quit */
+        case 4: /* change global settings */
+            {
+                struct preferences orig_prefs;
+
+                rb->memcpy(&orig_prefs, &prefs, sizeof(struct preferences));
+                if (!viewer_load_global_settings())
+                    viewer_default_preferences();
+                done = viewer_options_menu(true);
+                viewer_save_global_settings();
+                rb->memcpy(&prefs, &orig_prefs, sizeof(struct preferences));
+            }
+            break;
+        case 5: /* quit */
             viewer_exit(NULL);
             done = true;
             break;