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MSSIPOTF_E_FILE
The failure is in file I/O, not necessarily font data
MSSIPOTF_E_FILE wraps an underlying file operation failure such as open, map, read, or write. It does not by itself prove that the font content is malformed. The same bytes might validate correctly after the storage, path, permissions, sharing, or transient I/O condition is fixed.
Separate this from a structural OpenType error by copying the exact artifact to stable local storage and repeating the operation there. If the error disappears, investigate the file path and transport. If it persists with a reliable local copy, follow the more specific lower-level diagnostic that the tool may have emitted.
How to investigate
- Record the filesystem path, file size, ACL context, and any network or temporary-file layer involved.
- Test a byte-identical local copy before changing the font itself.
- Capture the operating-system I/O error from the caller or logs; this HRESULT alone does not retain the root cause.
References
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