HRESULT SetImplTypeCustData(
  unsigned int  index,  
  REFGUID  guid,        
  VARIANT  *pVarVal,    
);
 Sets the implementation type for custom data.
The return value obtained from the returned HRESULT is one of the following:
| Return value | Meaning | 
|---|---|
| S_OK | Success. | 
| E_OUTOFMEMORY | Out of memory. | 
| E_INVALIDARG | One or more of the arguments is invalid. |