Contains the custom data. It is defined as follows:
typedef struct  tagCUSTDATAITEM
    {
    GUID guid;
    VARIANTARG varValue;
    }    CUSTDATAITEM;
 
The following table describes the fields of the CUSTDATAITEM structure.
| Value | Description | 
|---|---|
| guid | Unique identifier for this data item | 
| varValue | Value of this data item |