When you delete an object with Extended Entity Data (xdata), a regapp ID remains in the application ID (APPID) symbol table. When a file contains excess unreferenced regapp IDs, performance and file size may be negatively affected.
This utility removes excess unreferenced registered application (regapp) IDs from multiple files simultaneously.
You can also clean affected files unattended from the Command prompt.
This utility works even without full AutoCAD. DWG TrueView 2013 can also be used.
The free utility is available here among Autodesk’s Updates & Service Packs.