diff --git a/swilib/include/swilib/explorer.h b/swilib/include/swilib/explorer.h
index 3cace868..48da0c54 100644
--- a/swilib/include/swilib/explorer.h
+++ b/swilib/include/swilib/explorer.h
@@ -173,6 +173,18 @@ __swi_begin(0x2DB)
 void MediaSendCSM_Open(const WSHDR *file, const WSHDR *path)
 __swi_end(0x2DB, MediaSendCSM_Open, (file, path));
 
+/**
+ * Open menu for setting resource as Wallpaper, Logo, Ringtone, etc..
+ * @param file_name	name of the file, example "beans_recipe.jpg"
+ * @param dir		directory of the file, example "0:\\Pictures"
+ * @param flag		0 or 2
+ * @param open_mode	unknown param, set 0
+ * @return CSM ID
+ * */
+__swi_begin(0x3CC)
+int PersMenuCSM_Open(const WSHDR *file_name, const WSHDR *dir, int flag, int open_mode)
+__swi_end(0x3CC, PersMenuCSM_Open, (file_name, dir, flag, open_mode));
+
 /**
  * Open NativeExplorer.
  * @param data		options for the opening explorer
@@ -250,6 +262,17 @@ __swi_begin(0x1F1)
 int ExplorerSetTransferState(char transfer_id, int state)
 __swi_end(0x1F1, ExplorerSetTransferState, (transfer_id, state));
 
+/**
+ * Get MIME type
+ * @param uid				file uid, see #GetExtUid_ws, #GetExtUidByFileName_ws
+ * @param[out] mime_type	pointer to WSHDR string
+ * @param unk_0				unknown param, set to 0
+ * @return 1: success, 0: error
+ * */
+__swi_begin(0x3C8)
+int GetMimeType(int uid, WSHDR *mime_type, int unk_0)
+__swi_end(0x3C8, GetMimeType, (uid, mime_type, unk_0));
+
 __swilib_end
 
 /** @} */
diff --git a/swilib/include/swilib/wstring.h b/swilib/include/swilib/wstring.h
index 3a3361fc..587d5cbc 100644
--- a/swilib/include/swilib/wstring.h
+++ b/swilib/include/swilib/wstring.h
@@ -223,6 +223,19 @@ __swi_begin(0x2E2)
 int wstrcmp(WSHDR *str1, WSHDR *str2)
 __swi_end(0x2E2, wstrcmp, (str1, str2));
 
+/**
+ * Compare two WSHDR strings, up to a specific length
+ * @param ws1	WSHDR to be compared
+ * @param ws2	WSHDR to be compared
+ * @param n		length
+ * @return <0	- the first character that does not match has a lower value in ws1 than in ws2
+ * @return 0	- the contents of both strings are equal
+ * @return >0	- the first character that does not match has a greater value in ws1 than in ws2
+ * */
+__swi_begin(0x3C9)
+int wstrncmp(const WSHDR *ws1, const WSHDR *ws2, size_t n)
+__swi_end(0x3C9, wstrncmp, (ws1, ws2, n));
+
 /**
  * Get WSHDR length.
  * @param str	pointer to the WSHDR