If you do not want to Inventory Windows Store Apps you can disable the feature with a RegKey
Create a new DWORD registry value under: HKLM\Software\Altiris\Altiris Agent\SMFAgent\Inventory with a Property of: DisableWindowsAppScanner and set the Value to: 1
If you want you can create custom inventory to capture Windows 10 built-in Apps for specific computers https://www.symantec.com/docs/HOWTO129701