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diff --git a/libtest/callbacks-example-filename.c b/libtest/callbacks-example-filename.c
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+/*
+    HTTrack external callbacks example : changing the destination filename
+    .c file
+
+    How to use:
+    - compile this file as a module (callback.so or callback.dll)
+      example:
+      (with gcc)
+      gcc -O -g3 -Wall -D_REENTRANT -DINET6 -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -shared -o callback.so callbacks-example-filename.c
+      or (with visual c++)
+      cl -LD -nologo -W3 -Zi -Zp4 -DWIN32 -Fe"callback.dll" callbacks-example-filename.c
+    - use the --wrapper option in httrack:
+      httrack --wrapper save-name=callback:mysavename
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+/* "External" */
+#ifdef _WIN32
+#define EXTERNAL_FUNCTION __declspec(dllexport)
+#else
+#define EXTERNAL_FUNCTION 
+#endif
+
+/* Function definitions */
+EXTERNAL_FUNCTION int mysavename(char* adr_complete, char* fil_complete, char* referer_adr, char* referer_fil, char* save);
+
+/* TOLOWER */
+#define TOLOWER_(a) (a >= 'A' && a <= 'Z') ? (a + ('a' - 'A')) : a
+#define TOLOWER(a) ( TOLOWER_( (a) ) )
+
+/*
+  This sample just changes the destination filenames to ROT-13 equivalent ; that is,
+  a -> n
+  b -> o
+  c -> p
+  d -> q
+  ..
+  n -> a
+  o -> b
+  ..
+
+  <parent> -> <link>
+  This sample can be improved, for example, to make a map of a website.
+*/
+
+/*
+"check-html" callback
+from htsdefines.h:
+typedef int   (* t_hts_htmlcheck_savename)(char* adr_complete,char* fil_complete,char* referer_adr,char* referer_fil,char* save);
+*/
+EXTERNAL_FUNCTION int mysavename(char* adr_complete, char* fil_complete, char* referer_adr, char* referer_fil, char* save) {
+  char* a = save;
+  while(*a) {
+    char c = TOLOWER(*a);
+    if (c >= 'a' && c <= 'z')
+      *a = ( ( ( c - 'a' ) + 13 ) % 26 ) + 'a';     // ROT-13
+    a++;
+  }
+  
+  return 1;  /* success */
+}