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**Summary** The `python-docx` error `docx.opc.exceptions.PackageNotFoundError` arises both when no file exists at the given path and when the file exists but is not a ZIP archive (and so is not a DOCX file). This ambiguity is unwelcome when diagnosing the error as the two possible conditions generally indicate a different course of action to resolve the error. Add detailed validation to `DocxPartitionerOptions` to distinguish these two and provide more precise exception messages. **Additional Context** - `python-pptx` shares the same OPC-Package (file) loading code used by `python-docx`, so the same ambiguity will be present in `python-pptx`. - It would be preferable for this distinguished exception behavior to be upstream in `python-docx` and `python-pptx`. If we're willing to take the version bump it might be worth considering doing that instead.