diff --git a/apps/filetree.c b/apps/filetree.c
index 29335fdcbe..4f14e48104 100644
--- a/apps/filetree.c
+++ b/apps/filetree.c
@@ -552,7 +552,7 @@ int ft_enter(struct tree_context* c)
 
             default:
             {
-                char* plugin;
+                const char* plugin;
 
                 if (global_settings.party_mode) {
                     gui_syncsplash(HZ, ID2P(LANG_PARTY_MODE));
diff --git a/apps/filetypes.c b/apps/filetypes.c
index 722456b8f4..ead2295f70 100644
--- a/apps/filetypes.c
+++ b/apps/filetypes.c
@@ -518,5 +518,5 @@ int filetype_load_plugin(const char* plugin, char* file)
         return PLUGIN_ERROR;
     snprintf(plugin_name, MAX_PATH, "%s/%s.%s",
              PLUGIN_DIR, filetypes[i].plugin, ROCK_EXTENSION);
-    return plugin_load(plugin_name,file);
+    return plugin_load(plugin_name, file);
 }
diff --git a/apps/filetypes.h b/apps/filetypes.h
index 52e60eab1f..66553e5b24 100644
--- a/apps/filetypes.h
+++ b/apps/filetypes.h
@@ -60,7 +60,7 @@ void read_color_theme_file(void);
 /* Return the attribute (FILE_ATTR_*) of the file */
 int filetype_get_attr(const char* file);
 #ifdef HAVE_LCD_COLOR
-int filetype_get_color(const char * name, int attr);
+int filetype_get_color(const char* name, int attr);
 #endif
 int filetype_get_icon(int attr);
 /* return the plugin filename associated with the file */
diff --git a/apps/gui/backdrop.c b/apps/gui/backdrop.c
index 0d023602be..67f96a31f2 100644
--- a/apps/gui/backdrop.c
+++ b/apps/gui/backdrop.c
@@ -42,7 +42,7 @@ static bool main_backdrop_valid = false;
 static bool wps_backdrop_valid = false;
 
 /* load a backdrop into a buffer */
-static bool load_backdrop(char* filename, fb_data* backdrop_buffer)
+static bool load_backdrop(const char* filename, fb_data* backdrop_buffer)
 {
     struct bitmap bm;
     int ret;
@@ -62,13 +62,13 @@ static bool load_backdrop(char* filename, fb_data* backdrop_buffer)
     }
 }
 
-bool load_main_backdrop(char* filename)
+bool load_main_backdrop(const char* filename)
 {
     main_backdrop_valid = load_backdrop(filename, &main_backdrop[0][0]);
     return main_backdrop_valid;
 }
 
-bool load_wps_backdrop(char* filename)
+bool load_wps_backdrop(const char* filename)
 {
     wps_backdrop_valid = load_backdrop(filename, &wps_backdrop[0][0]);
     return wps_backdrop_valid;
@@ -104,7 +104,7 @@ void show_wps_backdrop(void)
 
 #if defined(HAVE_REMOTE_LCD) && LCD_REMOTE_DEPTH > 1
 
-static bool load_remote_backdrop(char* filename, fb_remote_data* backdrop_buffer)
+static bool load_remote_backdrop(const char* filename, fb_remote_data* backdrop_buffer)
 {
     struct bitmap bm;
     int ret;
diff --git a/apps/gui/backdrop.h b/apps/gui/backdrop.h
index c930a87433..a05cb633f6 100644
--- a/apps/gui/backdrop.h
+++ b/apps/gui/backdrop.h
@@ -25,8 +25,8 @@
 #include "lcd.h"
 #include "bmp.h"
 
-bool load_main_backdrop(char* filename);
-bool load_wps_backdrop(char* filename);
+bool load_main_backdrop(const char* filename);
+bool load_wps_backdrop(const char* filename);
 
 void unload_main_backdrop(void);
 void unload_wps_backdrop(void);
@@ -37,7 +37,7 @@ void show_wps_backdrop(void);
 #endif /* LCD_DEPTH > 1 */
 
 #if defined(HAVE_REMOTE_LCD) && LCD_REMOTE_DEPTH > 1
-bool load_remote_wps_backdrop(char* filename);
+bool load_remote_wps_backdrop(const char* filename);
 void unload_remote_wps_backdrop(void);
 void show_remote_wps_backdrop(void);
 void show_remote_main_backdrop(void); /* only clears the wps backdrop */
diff --git a/apps/playlist.c b/apps/playlist.c
index c3072ddfd2..30fd0f11e9 100644
--- a/apps/playlist.c
+++ b/apps/playlist.c
@@ -179,7 +179,7 @@ static int get_next_dir(char *dir, bool is_forward, bool recursion);
 static int get_previous_directory(char *dir);
 static int check_subdir_for_music(char *dir, char *subdir);
 static int format_track_path(char *dest, char *src, int buf_length, int max,
-                             char *dir);
+                             const char *dir);
 static void display_playlist_count(int count, const unsigned char *fmt,
                                    bool final);
 static void display_buffer_full(void);
@@ -317,24 +317,26 @@ static void empty_playlist(struct playlist_info* playlist, bool resume)
 static void new_playlist(struct playlist_info* playlist, const char *dir,
                          const char *file)
 {
+    const char *fileused = file;
+    const char *dirused = dir;
     empty_playlist(playlist, false);
 
-    if (!file)
+    if (!fileused)
     {
-        file = "";
+        fileused = "";
 
-        if (dir && playlist->current) /* !current cannot be in_ram */
+        if (dirused && playlist->current) /* !current cannot be in_ram */
             playlist->in_ram = true;
         else
-            dir = ""; /* empty playlist */
+            dirused = ""; /* empty playlist */
     }
     
-    update_playlist_filename(playlist, dir, file);
+    update_playlist_filename(playlist, dirused, fileused);
 
     if (playlist->control_fd >= 0)
     {
         update_control(playlist, PLAYLIST_COMMAND_PLAYLIST,
-            PLAYLIST_CONTROL_FILE_VERSION, -1, dir, file, NULL);
+            PLAYLIST_CONTROL_FILE_VERSION, -1, dirused, fileused, NULL);
         sync_control(playlist, false);
     }
 }
@@ -1676,7 +1678,7 @@ static int check_subdir_for_music(char *dir, char *subdir)
  * Returns absolute path of track
  */
 static int format_track_path(char *dest, char *src, int buf_length, int max,
-                             char *dir)
+                             const char *dir)
 {
     int i = 0;
     int j;
@@ -2953,13 +2955,13 @@ int playlist_insert_directory(struct playlist_info* playlist,
 /*
  * Insert all tracks from specified playlist into dynamic playlist.
  */
-int playlist_insert_playlist(struct playlist_info* playlist, char *filename,
+int playlist_insert_playlist(struct playlist_info* playlist, const char *filename,
                              int position, bool queue)
 {
     int fd;
     int max;
     char *temp_ptr;
-    char *dir;
+    const char *dir;
     unsigned char *count_str;
     char temp_buf[MAX_PATH+1];
     char trackname[MAX_PATH+1];
diff --git a/apps/playlist.h b/apps/playlist.h
index 006ae591c4..d6523bcdcf 100644
--- a/apps/playlist.h
+++ b/apps/playlist.h
@@ -142,7 +142,7 @@ int playlist_insert_track(struct playlist_info* playlist, const char *filename,
 int playlist_insert_directory(struct playlist_info* playlist,
                               const char *dirname, int position, bool queue,
                               bool recurse);
-int playlist_insert_playlist(struct playlist_info* playlist, char *filename,
+int playlist_insert_playlist(struct playlist_info* playlist, const char *filename,
                              int position, bool queue);
 void playlist_skip_entry(struct playlist_info *playlist, int steps);
 int playlist_delete(struct playlist_info* playlist, int index);
diff --git a/apps/playlist_catalog.c b/apps/playlist_catalog.c
index 17db24984b..ac86f48109 100644
--- a/apps/playlist_catalog.c
+++ b/apps/playlist_catalog.c
@@ -323,7 +323,7 @@ static int add_track_to_playlist(char* filename, void* context)
 
 /* Add "sel" file into specified "playlist".  How to insert depends on type
    of file */
-static int add_to_playlist(const char* playlist, char* sel, int sel_attr)
+static int add_to_playlist(const char* playlist, const char* sel, int sel_attr)
 {
     int fd;
     int result = -1;
@@ -419,7 +419,7 @@ bool catalog_view_playlists(void)
     return true;
 }
 
-bool catalog_add_to_a_playlist(char* sel, int sel_attr,
+bool catalog_add_to_a_playlist(const char* sel, int sel_attr,
                                bool new_playlist, char *m3u8name)
 {
     char playlist[MAX_PATH];
diff --git a/apps/playlist_catalog.h b/apps/playlist_catalog.h
index 92cfa15ed9..adf757c398 100644
--- a/apps/playlist_catalog.h
+++ b/apps/playlist_catalog.h
@@ -35,7 +35,7 @@ bool catalog_view_playlists(void);
  *  m3u8name     : filename to save the playlist to, NULL to show the keyboard
  *  ret          : true if the file was successfully added
  */
-bool catalog_add_to_a_playlist(char* sel, int sel_attr,
+bool catalog_add_to_a_playlist(const char* sel, int sel_attr,
                                bool new_playlist, char* m3u8name);
 
 #endif
diff --git a/apps/playlist_viewer.c b/apps/playlist_viewer.c
index 8ad3d263de..b910ca449b 100644
--- a/apps/playlist_viewer.c
+++ b/apps/playlist_viewer.c
@@ -116,7 +116,7 @@ static struct playlist_entry * playlist_buffer_get_track(struct playlist_buffer
                                                          int index);
 
 static bool playlist_viewer_init(struct playlist_viewer * viewer,
-                                 char* filename, bool reload);
+                                 const char* filename, bool reload);
 
 static void format_name(char* dest, const char* src);
 static void format_line(const struct playlist_entry* track, char* str,
@@ -271,7 +271,7 @@ static struct playlist_entry * playlist_buffer_get_track(struct playlist_buffer
 
 /* Initialize the playlist viewer. */
 static bool playlist_viewer_init(struct playlist_viewer * viewer,
-                                 char* filename, bool reload)
+                                 const char* filename, bool reload)
 {
     char* buffer;
     size_t buffer_size;
@@ -304,7 +304,8 @@ static bool playlist_viewer_init(struct playlist_viewer * viewer,
     else
     {
         /* Viewing playlist on disk */
-        char *dir, *file, *temp_ptr;
+        const char *dir, *file;
+        char *temp_ptr;
         char *index_buffer = NULL;
         ssize_t index_buffer_size = 0;
 
@@ -591,7 +592,7 @@ static int playlist_callback_icons(int selected_item, void *data)
 
 /* Main viewer function.  Filename identifies playlist to be viewed.  If NULL,
    view current playlist. */
-bool playlist_viewer_ex(char* filename)
+bool playlist_viewer_ex(const char* filename)
 {
     bool ret = false;       /* return value */
     bool exit=false;        /* exit viewer */
diff --git a/apps/playlist_viewer.h b/apps/playlist_viewer.h
index 27f2e354c5..0caa23b6db 100644
--- a/apps/playlist_viewer.h
+++ b/apps/playlist_viewer.h
@@ -22,7 +22,7 @@
 #define _PLAYLIST_VIEWER_H_
 
 bool playlist_viewer(void);
-bool playlist_viewer_ex(char* filename);
+bool playlist_viewer_ex(const char* filename);
 bool search_playlist(void);
 
 #endif