/Remove-ProvisionedAppxPackage /PackageName: Removes app packages (.appx) from the image. App packages (.appx) will not be ...

/Remove-ProvisionedAppxPackage /PackageName: 

  Removes app packages (.appx) from the image. App packages (.appx) will not 
  be installed when new user accounts are created. 

    Example:
      DISM.exe /Image:C:\test\offline /Remove-ProvisionedAppxPackage 
        /PackageName:microsoft.appx.app1_1.0.0.0_neutral_en-us_ac4zc6fex2zjp