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TYPE_E_UNSUPFORMAT
TYPE_E_UNSUPFORMAT: the type library is in an old, invalid, or unsupported format
TYPE_E_UNSUPFORMAT (0x80028019) identifies a specific boundary: the type library is in an old, invalid, or unsupported format. Keep it separate from neighboring errors that may occur in the same product but represent a different lookup, state, trust, or transport decision.
Evidence to capture
Preserve the actual TLB/resource bytes and hash, producer/toolchain version, architecture, and LoadTypeLib result. Do not confuse a format rejection with an unregistered but otherwise valid library.
Corrective test
Regenerate or obtain the type library in a supported format from the matching product build and verify it loads before changing registry entries. Preserve the original identifiers while testing; if another HRESULT appears after this boundary is fixed, treat that value as the next-stage result.
Technical references
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