To turn off Office File Validation in Word, Excel, and PowerPoint, you need to follow this guide. You can do that with the help of the Local Group Policy Editor and the Registry Editor.

If you receive Office has detected a problem with this file, To help protect your computer this file cannot be opened, Editing it may harm your computer, see this.

Older versions of Microsoft Office that implemented Trust Center restrictions required that you edit the Microsoft Windows Registry to override the file-saving limitations on legacy formats.

Having been proven in the field in Office 2010, Microsoft is developing them for 2003 and 2007 because of the large installed bases of those versions.