Microsoft Office Binary File Format Validator
Office File Validation is a feature that was introduced in Microsoft Office 2010
Office File Validation (OFV) is a security feature that was introduced in Microsoft Office 2010. Office File Validation verifies that a particular binary file complies with the application’s expectations.
When you open Microsoft Office 97-2003 binary file (such as .doc) the file is compared to a binary schema. If the file fails this validation, you are notified that the document could be considered to be compromised.