Add a stub for StgCreateStorageEx(). Returns

dlls/ole32/ole32.spec

@@ -233,7 +233,7 @@
 @ stub SNB_UserUnmarshal
 @ stdcall StgCreateDocfile(wstr long long ptr)
 @ stdcall StgCreateDocfileOnILockBytes(ptr long long ptr)
-@ stub StgCreateStorageEx
+@ stdcall StgCreateStorageEx(wstr long long long ptr ptr ptr ptr)
 @ stub StgGetIFillLockBytesOnFile
 @ stub StgGetIFillLockBytesOnILockBytes
 @ stdcall StgIsStorageFile(wstr)

dlls/ole32/storage32.c

@@ -5536,6 +5536,13 @@ HRESULT WINAPI StgCreateDocfile(
   return hr;
 }
 
+HRESULT WINAPI StgCreateStorageEx(const WCHAR* pwcsName, DWORD grfMode, DWORD stgfmt, DWORD grfAttrs, STGOPTIONS* pStgOptions, void* reserved, REFIID riid, void** ppObjectOpen)
+{
+    TRACE("(%s, %lx, %lx, %lx, %p, %p, %p, %p)\n", debugstr_w(pwcsName),
+          grfMode, stgfmt, grfAttrs, pStgOptions, reserved, riid, ppObjectOpen);
+    return STG_E_UNIMPLEMENTEDFUNCTION;
+}
+
 /******************************************************************************
  *              StgOpenStorage        [OLE32.@]
  */

include/objbase.h

@@ -495,7 +495,16 @@ HRESULT WINAPI GetRunningObjectTable(DWORD reserved, LPRUNNINGOBJECTTABLE *pprot
 #define STGM_NOSCRATCH		0x00100000
 #define STGM_NOSNAPSHOT		0x00200000
 
+typedef struct tagSTGOPTIONS
+{
+    USHORT usVersion;
+    USHORT reserved;
+    ULONG ulSectorSize;
+    const WCHAR* pwcsTemplateFile;
+} STGOPTIONS;
+
 HRESULT WINAPI StgCreateDocfile(LPCOLESTR pwcsName,DWORD grfMode,DWORD reserved,IStorage **ppstgOpen);
+HRESULT WINAPI StgCreateStorageEx(const WCHAR*,DWORD,DWORD,DWORD,STGOPTIONS*,void*,REFIID,void**);
 HRESULT WINAPI StgIsStorageFile(LPCOLESTR fn);
 HRESULT WINAPI StgIsStorageILockBytes(ILockBytes *plkbyt);
 HRESULT WINAPI StgOpenStorage(const OLECHAR* pwcsName,IStorage* pstgPriority,DWORD grfMode,SNB snbExclude,DWORD reserved,IStorage**ppstgOpen);