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ERROR_SXS_UNKNOWN_ENCODING
ERROR_SXS_UNKNOWN_ENCODING means that the SxS loader encountered a text encoding it does not recognize while reading manifest data. This can occur when the XML declaration, byte-order mark, and actual file bytes disagree or when an unsupported encoding was introduced by a tool.
What to check
- Check the XML declaration, byte-order mark, and actual encoding of the exact deployed manifest.
- Regenerate the manifest with a supported encoding instead of converting it manually in an editor that changes metadata.
- Verify that installers and signing or packaging steps preserve the manifest bytes.
The issue is about how the manifest is encoded, not about the version of the assembly it names.
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