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ExtensionRegistry._load() catches json.JSONDecodeError and FileNotFoundError to start fresh on a corrupted or missing registry, but a .registry file with invalid UTF-8 bytes raised UnicodeDecodeError from the text-mode read before JSON parsing began. Because the registry is loaded in __init__, that bare traceback broke every extension command -- `specify extension list` on such a project exits with a raw UnicodeDecodeError instead of the module's clean path. Catch UnicodeDecodeError in the same clause: undecodable bytes are the same corruption class as unparseable JSON, only the exception type differs. OSError stays uncaught on purpose -- the data may be intact on disk, and starting fresh would let a later _save() wipe it. This is the exact twin of the PresetRegistry._load() fix in #3955; the two registries are parallel implementations and only the preset side was corrected. _get_installed_sibling_ids() already worked around this gap locally by catching UnicodeError at its own call site; its comment is updated to reflect that _load() now handles the case itself, with the local catch kept as belt-and-braces against regression. Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>