Index: dll/win32/shlwapi/shlwapi.spec
===================================================================
--- dll/win32/shlwapi/shlwapi.spec	(revision 61577)
+++ dll/win32/shlwapi/shlwapi.spec	(working copy)
@@ -760,6 +760,7 @@
 @ stdcall StrCatBuffA (str str long)
 @ stdcall StrCatBuffW (wstr wstr long)
 @ stdcall StrCatW (ptr wstr)
+@ stdcall StrCatChainW (ptr long long wstr)
 @ stdcall StrChrA (str long)
 @ stdcall StrChrIA (str long)
 @ stdcall StrChrIW (wstr long)
Index: dll/win32/shlwapi/string.c
===================================================================
--- dll/win32/shlwapi/string.c	(revision 61577)
+++ dll/win32/shlwapi/string.c	(working copy)
@@ -438,11 +438,50 @@
 }
 
 /*************************************************************************
- * StrCpyW	[SHLWAPI.@]
+ * StrCatChainW	[SHLWAPI.@]
  *
- * Copy a string to another string.
+ * Concatenates two Unicode strings.
  *
  * PARAMS
+ *  pszDst [O] Initial string
+ *  cchDst     Length of destination buffer
+ *  ichAt      Offset from the destination buffer to begin concatenation
+ *  pszSrc [I] String to concatenate
+ *
+ * RETURNS
+ *  The offset from the beginning of pszDst to the terminating NULL.
+ */
+
+DWORD WINAPI StrCatChainW(PWSTR pszDst, DWORD cchDst, DWORD ichAt, PCWSTR pszSrc)
+{
+  LPWSTR d = pszDst;
+  LPCWSTR s = pszSrc;
+  DWORD mark;
+
+  TRACE("(%s,%i,%i,%s)\n", debugstr_w(pszDst), cchDst, ichAt, debugstr_w(pszSrc));
+
+  if (ichAt == -1)
+    mark = strlenW(pszDst);
+  else
+    mark = ichAt;
+  d = d + mark;
+  if (pszSrc)
+  {
+    while ((mark < cchDst-1) && *s)
+    {
+      mark++;
+      *d++ = *s++;
+    }
+  }
+  *d = 0;
+  return mark;
+}
+
+/*************************************************************************
+ * StrCpyW	[SHLWAPI.@]
+ *
+ * Copy a string to another string. *
+ * PARAMS
  *  lpszStr [O] Destination string
  *  lpszSrc [I] Source string
  *