diff --git a/dlls/d3dx10_43/font.c b/dlls/d3dx10_43/font.c
index 51704e2bbbe..1a95dbeca02 100644
--- a/dlls/d3dx10_43/font.c
+++ b/dlls/d3dx10_43/font.c
@@ -168,9 +168,50 @@ static HRESULT WINAPI d3dx_font_GetGlyphData(ID3DX10Font *iface, UINT glyph,
 
 static HRESULT WINAPI d3dx_font_PreloadCharacters(ID3DX10Font *iface, UINT first, UINT last)
 {
-    FIXME("iface %p, first %u, last %u stub!\n", iface, first, last);
+    struct d3dx_font *font = impl_from_ID3DX10Font(iface);
+    unsigned int i, count, start, end;
+    WORD *indices;
+    WCHAR *chars;
 
-    return E_NOTIMPL;
+    TRACE("iface %p, first %u, last %u.\n", iface, first, last);
+
+    if (last < first)
+        return S_OK;
+
+    count = last - first + 1;
+    indices = heap_alloc(count * sizeof(*indices));
+    if (!indices)
+        return E_OUTOFMEMORY;
+
+    chars = heap_alloc(count * sizeof(*chars));
+    if (!chars)
+    {
+        heap_free(indices);
+        return E_OUTOFMEMORY;
+    }
+
+    for (i = 0; i < count; ++i)
+        chars[i] = first + i;
+
+    GetGlyphIndicesW(font->hdc, chars, count, indices, 0);
+
+    start = end = indices[0];
+    for (i = 1; i < count; ++i)
+    {
+        if (indices[i] == end + 1)
+        {
+            end = indices[i];
+            continue;
+        }
+        ID3DX10Font_PreloadGlyphs(iface, start, end);
+        start = end = indices[i];
+    }
+    ID3DX10Font_PreloadGlyphs(iface, start, end);
+
+    heap_free(chars);
+    heap_free(indices);
+
+    return S_OK;
 }
 
 static HRESULT WINAPI d3dx_font_PreloadGlyphs(ID3DX10Font *iface, UINT first, UINT last)
diff --git a/dlls/d3dx10_43/tests/d3dx10.c b/dlls/d3dx10_43/tests/d3dx10.c
index 65bccb71521..c7aa3eccd24 100644
--- a/dlls/d3dx10_43/tests/d3dx10.c
+++ b/dlls/d3dx10_43/tests/d3dx10.c
@@ -2307,14 +2307,12 @@ todo_wine
         ID3D10ShaderResourceView_Release(srv);
 
     hr = ID3DX10Font_PreloadCharacters(font, 'b', 'a');
-todo_wine
     ok(hr == S_OK, "Unexpected hr %#x.\n", hr);
     hr = ID3DX10Font_PreloadGlyphs(font, 1, 0);
 todo_wine
     ok(hr == S_OK, "Unexpected hr %#x.\n", hr);
 
     hr = ID3DX10Font_PreloadCharacters(font, 'a', 'a');
-todo_wine
     ok(hr == S_OK, "Unexpected hr %#x.\n", hr);
 
     for (c = 'b'; c <= 'z'; ++c)
@@ -2376,7 +2374,6 @@ todo_wine
     }
 
     hr = ID3DX10Font_PreloadCharacters(font, 'a', 'z');
-todo_wine
     ok(hr == S_OK, "Unexpected hr %#x.\n", hr);
 
     /* Test multiple textures */