1.7 Vendor Extensible Fields

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HRESULTs: Vendors can choose their own values, as long as the C bit (0x20000000) is set, indicating it is a customer code. The structures documented in this specification have no vendor-extensible fields.

Win32 Error Codes: Vendors can only reuse these values with their indicated meanings. Choosing any other value runs the risk of a collision in the future.

NTSTATUS: Vendors can choose their own values for this field, as long as the C bit (0x20000000) is set, indicating it is a customer code.