@NT5000 You can still open older Office formats, but you are better off migrating them to the .*x formats that we've had since 2003.
The rest of your post is not really comprehensible to someone without a whole more contextual information. You should file a support ticket with Microsoft if necessary. You may get help with a Word-focussed support group as it doesn't sound like a lot of this is actually a OneDrive issue, but you still need to supply tons more information for anyone to assist.