Hi Michael,
Thank you for contacting Syncfusion support.
DocIO provides support to open the Word document in read only mode. You can use OpenReadOnly API of WordDocument class to open the document in read only mode. Please find the following code snippet for your reference.
Code Snippet:
WordDocument document = new WordDocument();
document.OpenReadOnly(Filename, FormatType.Docx);
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Regards,
Suganya