diff --git a/dlls/d3dcompiler_43/blob.c b/dlls/d3dcompiler_43/blob.c
index 865d139ccd8..f22dc7183d5 100644
--- a/dlls/d3dcompiler_43/blob.c
+++ b/dlls/d3dcompiler_43/blob.c
@@ -463,3 +463,17 @@ HRESULT WINAPI D3DStripShader(const void *data, SIZE_T data_size, UINT flags, ID
 
     return d3dcompiler_strip_shader(data, data_size, flags, blob);
 }
+
+HRESULT WINAPI D3DReadFileToBlob(const WCHAR *filename, ID3DBlob **contents)
+{
+    FIXME("filename %s, contents %p\n", debugstr_w(filename), contents);
+
+    return E_NOTIMPL;
+}
+
+HRESULT WINAPI D3DWriteBlobToFile(ID3DBlob* blob, const WCHAR *filename, BOOL overwrite)
+{
+    FIXME("blob %p, filename %s, overwrite %d\n", blob, debugstr_w(filename), overwrite);
+
+    return E_NOTIMPL;
+}
diff --git a/dlls/d3dcompiler_46/d3dcompiler_46.spec b/dlls/d3dcompiler_46/d3dcompiler_46.spec
index 1b145c8a401..7234c41ce3b 100644
--- a/dlls/d3dcompiler_46/d3dcompiler_46.spec
+++ b/dlls/d3dcompiler_46/d3dcompiler_46.spec
@@ -16,10 +16,10 @@
 @ stdcall D3DGetOutputSignatureBlob(ptr long ptr)
 @ stub D3DGetTraceInstructionOffsets
 @ stdcall D3DPreprocess(ptr long str ptr ptr ptr ptr)
-@ stub D3DReadFileToBlob
+@ stdcall D3DReadFileToBlob(wstr ptr)
 @ stdcall D3DReflect(ptr long ptr ptr)
 @ stub D3DReturnFailure1
 @ stub D3DSetBlobPart
 @ stdcall D3DStripShader(ptr long long ptr)
-@ stub D3DWriteBlobToFile
+@ stdcall D3DWriteBlobToFile(ptr wstr long)
 @ stub DebugSetMute
diff --git a/dlls/d3dcompiler_47/d3dcompiler_47.spec b/dlls/d3dcompiler_47/d3dcompiler_47.spec
index efa47679a31..9b2cb7d7a2c 100644
--- a/dlls/d3dcompiler_47/d3dcompiler_47.spec
+++ b/dlls/d3dcompiler_47/d3dcompiler_47.spec
@@ -19,11 +19,11 @@
 @ stub D3DGetTraceInstructionOffsets
 @ stub D3DLoadModule
 @ stdcall D3DPreprocess(ptr long str ptr ptr ptr ptr)
-@ stub D3DReadFileToBlob
+@ stdcall D3DReadFileToBlob(wstr ptr)
 @ stdcall D3DReflect(ptr long ptr ptr)
 @ stub D3DReflectLibrary
 @ stub D3DReturnFailure1
 @ stub D3DSetBlobPart
 @ stdcall D3DStripShader(ptr long long ptr)
-@ stub D3DWriteBlobToFile
+@ stdcall D3DWriteBlobToFile(ptr wstr long)
 @ stub DebugSetMute
diff --git a/include/d3dcompiler.h b/include/d3dcompiler.h
index b5e79e6ad16..3f1fdb3faa2 100644
--- a/include/d3dcompiler.h
+++ b/include/d3dcompiler.h
@@ -107,7 +107,8 @@ HRESULT WINAPI D3DGetInputSignatureBlob(const void *data, SIZE_T data_size, ID3D
 HRESULT WINAPI D3DGetOutputSignatureBlob(const void *data, SIZE_T data_size, ID3DBlob **blob);
 HRESULT WINAPI D3DGetInputAndOutputSignatureBlob(const void *data, SIZE_T data_size, ID3DBlob **blob);
 HRESULT WINAPI D3DGetDebugInfo(const void *data, SIZE_T data_size, ID3DBlob **blob);
-
+HRESULT WINAPI D3DReadFileToBlob(const WCHAR *filename, ID3DBlob **contents);
+HRESULT WINAPI D3DWriteBlobToFile(ID3DBlob *blob, const WCHAR *filename, BOOL overwrite);
 HRESULT WINAPI D3DReflect(const void *data, SIZE_T data_size, REFIID riid, void **reflector);
 
 HRESULT WINAPI D3DCreateBlob(SIZE_T data_size, ID3DBlob **blob);