/Import-DefaultAppAssociations: Imports a set of default application associations to a specified Windows image from an .xml ...

/Import-DefaultAppAssociations: 

  Imports a set of default application associations to a specified Windows 
  image from an .xml file. The default application associations will be 
  applied for each user during their first logon. 

    Examples: 
      Dism.exe /Image:C:\test\offline 
        /Import-DefaultAppAssociations:C:\AppAssoc.xml 
      Dism.exe /Online /Import-DefaultAppAssociations:C:\AppAssoc.xml 

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