Hi R.Pradeep,
According to your description, my understanding is that the files/data were not created with Word 2007. It might be create with third-party program. Am I right?
Then, would you like to share us the error/alert message when you open the files with Word 2007?
You might share us a sample file, I’m glad to help and follow up your reply.
Regards,
George Zhao
TechNet Community Support
It's recommended to download and install
Configuration Analyzer Tool (OffCAT), which is developed by Microsoft Support teams. Once the tool is installed, you can run it at any time to scan for hundreds of known issues in Office
programs.
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