diff --git a/dlls/ntdll/nt.c b/dlls/ntdll/nt.c
index 5db057c6ea2..3a09c4323e9 100644
--- a/dlls/ntdll/nt.c
+++ b/dlls/ntdll/nt.c
@@ -2,7 +2,7 @@
  * NT basis DLL
  * 
  * This file contains the Nt* API functions of NTDLL.DLL.
- * In the original ntdll.dll they all seem to just call int 0x2e (down to the HAL)
+ * In the original ntdll.dll they all seem to just call int 0x2e (down to the NTOSKRNL)
  *
  * Copyright 1996-1998 Marcus Meissner
  */
diff --git a/dlls/ntdll/ntdll.spec b/dlls/ntdll/ntdll.spec
index 27486d62e80..e025ebfb477 100644
--- a/dlls/ntdll/ntdll.spec
+++ b/dlls/ntdll/ntdll.spec
@@ -185,6 +185,7 @@ debug_channels (aspi atom cdrom console ddraw debug delayhlp dll dosfs dosmem
 @ stdcall NtQueryTimerResolution(long long long) NtQueryTimerResolution
 @ stdcall NtQueryValueKey(long long long long long long) NtQueryValueKey
 @ stub NtQueryVirtualMemory
+@ stdcall NtQueryVolumeInformationFile(long ptr ptr long long) NtQueryVolumeInformationFile
 @ stdcall NtRaiseException(ptr ptr long) NtRaiseException
 @ stub NtRaiseHardError
 @ stdcall NtReadFile(long long long long long long long long long) NtReadFile
@@ -686,7 +687,7 @@ debug_channels (aspi atom cdrom console ddraw debug delayhlp dll dosfs dosmem
 @ stub ZwQueryTimerResolution
 @ stub ZwQueryValueKey
 @ stub ZwQueryVirtualMemory
-@ stub ZwQueryVolumeInformationFile
+@ stdcall ZwQueryVolumeInformationFile(long ptr ptr long long) NtQueryVolumeInformationFile
 @ stub ZwRaiseException
 @ stub ZwRaiseHardError
 @ stdcall ZwReadFile(long long long long long long long long long) NtReadFile
@@ -894,7 +895,7 @@ debug_channels (aspi atom cdrom console ddraw debug delayhlp dll dosfs dosmem
 @ cdecl _strnicmp(str str long) strncasecmp
 @ cdecl _strupr(str) _strupr
 @ cdecl _ultoa(long ptr long) _ultoa
-@ stub _ultow
+@ cdecl _ultow(long ptr long) _ultow
 @ cdecl _vsnprintf(ptr long ptr ptr) vsnprintf
 @ cdecl _wcsicmp(wstr wstr) NTDLL__wcsicmp
 @ cdecl _wcslwr(wstr) NTDLL__wcslwr
diff --git a/dlls/ntdll/wcstring.c b/dlls/ntdll/wcstring.c
index 4cce518d876..6f43b0b4835 100644
--- a/dlls/ntdll/wcstring.c
+++ b/dlls/ntdll/wcstring.c
@@ -301,3 +301,36 @@ INT __cdecl NTDLL_iswalpha( WCHAR wc )
 {
     return get_char_typeW(wc) & C1_ALPHA;
 }
+
+
+/*********************************************************************
+ *           _ultow    (NTDLL)
+ * Like _ultoa, but for wide character strings.
+ */
+LPWSTR __cdecl _ultow(ULONG value, LPWSTR string, INT radix)
+{
+    WCHAR tmp[33];
+    LPWSTR tp = tmp;
+    LPWSTR sp;
+    LONG i;
+    ULONG v = value;
+
+    if (radix > 36 || radix <= 1)
+	return 0;
+
+    while (v || tp == tmp)
+    {
+	i = v % radix;
+	v = v / radix;
+	if (i < 10)
+	    *tp++ = i + '0';
+	else
+	    *tp++ = i + 'a' - 10;
+    }
+
+    sp = string;
+    while (tp > tmp)
+	*sp++ = *--tp;
+    *sp = 0;
+    return string;
+}