Currently the Vault Explorer application allows CAD/Design files to be Checked Out (outside the CAD environment).
When using this workflow the properties are NOT synchronised resulting in incorrect data in the CAD file:
wrong revision number, revision table and other mapped properties.
The synchronisation of the properties is only executed when you Check Out by using the CAD add-in. The integration has extra layers of code for handling the CAD file, including synchronizing properties, relation checks and more.
As an admin you can 'disable Check In of Design Files' but you can't 'disable Check Out of design Files' to prevent users to Check Out CAD/Design files from the Vault Explorer application and thus forcing them to use the Check Out from the CAD add-in with the correct behaviour. Even better would be if a Check Out from Vault Explorer had the same behaviour as a Check Out from the CAD integration.