diff --git a/dlls/d3dx9_36/d3dx9_36_private.h b/dlls/d3dx9_36/d3dx9_36_private.h
index 08a73c2..451615b 100644
--- a/dlls/d3dx9_36/d3dx9_36_private.h
+++ b/dlls/d3dx9_36/d3dx9_36_private.h
@@ -67,7 +67,7 @@
     void (*to_rgba)(const struct vec4 *src, struct vec4 *dst, const PALETTEENTRY *palette);
 };
 
-HRESULT map_view_of_file(LPCWSTR filename, LPVOID *buffer, DWORD *length) DECLSPEC_HIDDEN;
+HRESULT map_view_of_file(const WCHAR *filename, void **buffer, DWORD *length) DECLSPEC_HIDDEN;
 HRESULT load_resource_into_memory(HMODULE module, HRSRC resinfo, LPVOID *buffer, DWORD *length) DECLSPEC_HIDDEN;
 
 HRESULT write_buffer_to_file(const WCHAR *filename, ID3DXBuffer *buffer) DECLSPEC_HIDDEN;
diff --git a/dlls/d3dx9_36/shader.c b/dlls/d3dx9_36/shader.c
index e3f6d5c..66a38ab 100644
--- a/dlls/d3dx9_36/shader.c
+++ b/dlls/d3dx9_36/shader.c
@@ -347,7 +347,10 @@
     HRSRC res;
     DWORD len;
 
-    if (!(res = FindResourceW(module, resource, (LPCWSTR)RT_RCDATA)))
+    TRACE("module %p, resource %s, defines %p, include %p, flags %#x, shader %p, error_messages %p.\n",
+            module, debugstr_w(resource), defines, include, flags, shader, error_messages);
+
+    if (!(res = FindResourceW(module, resource, (const WCHAR *)RT_RCDATA)))
         return D3DXERR_INVALIDDATA;
     if (FAILED(load_resource_into_memory(module, res, &buffer, &len)))
         return D3DXERR_INVALIDDATA;
@@ -468,7 +471,12 @@
     HRSRC res;
     DWORD len;
 
-    if (!(res = FindResourceW(module, resource, (LPCWSTR)RT_RCDATA)))
+    TRACE("module %p, resource %s, defines %p, include %p, entrypoint %s, profile %s, "
+            "flags %#x, shader %p, error_messages %p, constant_table %p.\n",
+            module, debugstr_w(resource), defines, include, debugstr_a(entrypoint), debugstr_a(profile),
+            flags, shader, error_messages, constant_table);
+
+    if (!(res = FindResourceW(module, resource, (const WCHAR *)RT_RCDATA)))
         return D3DXERR_INVALIDDATA;
     if (FAILED(load_resource_into_memory(module, res, &buffer, &len)))
         return D3DXERR_INVALIDDATA;
diff --git a/dlls/d3dx9_36/surface.c b/dlls/d3dx9_36/surface.c
index 9b76457..2f4499e 100644
--- a/dlls/d3dx9_36/surface.c
+++ b/dlls/d3dx9_36/surface.c
@@ -919,18 +919,19 @@
     return hr;
 }
 
-HRESULT WINAPI D3DXGetImageInfoFromFileW(LPCWSTR file, D3DXIMAGE_INFO *info)
+HRESULT WINAPI D3DXGetImageInfoFromFileW(const WCHAR *file, D3DXIMAGE_INFO *info)
 {
+    void *buffer;
     HRESULT hr;
     DWORD size;
-    LPVOID buffer;
 
-    TRACE("(%s, %p): relay\n", debugstr_w(file), info);
+    TRACE("file %s, info %p.\n", debugstr_w(file), info);
 
-    if( !file ) return D3DERR_INVALIDCALL;
+    if (!file)
+        return D3DERR_INVALIDCALL;
 
-    hr = map_view_of_file(file, &buffer, &size);
-    if(FAILED(hr)) return D3DXERR_INVALIDDATA;
+    if (FAILED(map_view_of_file(file, &buffer, &size)))
+        return D3DXERR_INVALIDDATA;
 
     hr = D3DXGetImageInfoFromFileInMemory(buffer, size, info);
     UnmapViewOfFile(buffer);
diff --git a/dlls/d3dx9_36/util.c b/dlls/d3dx9_36/util.c
index 5463e42..1fae956 100644
--- a/dlls/d3dx9_36/util.c
+++ b/dlls/d3dx9_36/util.c
@@ -108,7 +108,7 @@
  *   The caller must UnmapViewOfFile when it doesn't need the data anymore
  *
  */
-HRESULT map_view_of_file(LPCWSTR filename, LPVOID *buffer, DWORD *length)
+HRESULT map_view_of_file(const WCHAR *filename, void **buffer, DWORD *length)
 {
     HANDLE hfile, hmapping = NULL;
 
diff --git a/include/d3dx9core.h b/include/d3dx9core.h
index b6226d6..c28fe71 100644
--- a/include/d3dx9core.h
+++ b/include/d3dx9core.h
@@ -144,7 +144,7 @@
     STDMETHOD(PreloadCharacters)(THIS_ UINT first, UINT last) PURE;
     STDMETHOD(PreloadGlyphs)(THIS_ UINT first, UINT last) PURE;
     STDMETHOD(PreloadTextA)(THIS_ LPCSTR string, INT count) PURE;
-    STDMETHOD(PreloadTextW)(THIS_ LPCWSTR string, INT count) PURE;
+    STDMETHOD(PreloadTextW)(THIS_ const WCHAR *string, INT count) PURE;
 
     STDMETHOD_(INT, DrawTextA)(THIS_ struct ID3DXSprite *sprite, const char *string,
             INT count, RECT *rect, DWORD format, D3DCOLOR color) PURE;
diff --git a/include/d3dx9tex.h b/include/d3dx9tex.h
index d10e01d..295a324 100644
--- a/include/d3dx9tex.h
+++ b/include/d3dx9tex.h
@@ -93,11 +93,11 @@
 
 /* Image Information */
 HRESULT WINAPI D3DXGetImageInfoFromFileA(LPCSTR file, D3DXIMAGE_INFO *info);
-HRESULT WINAPI D3DXGetImageInfoFromFileW(LPCWSTR file, D3DXIMAGE_INFO *info);
+HRESULT WINAPI D3DXGetImageInfoFromFileW(const WCHAR *file, D3DXIMAGE_INFO *info);
 #define        D3DXGetImageInfoFromFile WINELIB_NAME_AW(D3DXGetImageInfoFromFile)
 
 HRESULT WINAPI D3DXGetImageInfoFromResourceA(HMODULE module, LPCSTR resource, D3DXIMAGE_INFO *info);
-HRESULT WINAPI D3DXGetImageInfoFromResourceW(HMODULE module, LPCWSTR resource, D3DXIMAGE_INFO *info);
+HRESULT WINAPI D3DXGetImageInfoFromResourceW(HMODULE module, const WCHAR *resource, D3DXIMAGE_INFO *info);
 #define        D3DXGetImageInfoFromResource WINELIB_NAME_AW(D3DXGetImageInfoFromResource)
 
 HRESULT WINAPI D3DXGetImageInfoFromFileInMemory(LPCVOID data, UINT datasize, D3DXIMAGE_INFO *info);