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MSSIPOTF_E_PCONST_CHECK
A partially constant table failed an invariant
MSSIPOTF_E_PCONST_CHECK is deliberately less descriptive than the nearby table-directory or checksum codes. The published error text says that a check failed in a partially constant table, but it does not identify the table, field, or invariant. The code should therefore be used to preserve diagnostic context rather than to guess a single repair.
Treat the failure as a format-level consistency issue. The offending structure can contain fixed fields combined with variable data; a validator may reject a value that is syntactically readable but inconsistent with the layout or version it expects. Use the tool’s detailed report and a second parser to narrow the failure before rebuilding the source table.
How to investigate
- Keep the exact validator output, version, and command line because the HRESULT alone does not name the table.
- Check earlier, more specific structural errors first; they may explain the failed invariant.
- Regenerate the suspected table from the authoritative font source instead of filling fields with constants from an unrelated font.
References
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