using namespace System.Xml; $null = New-Module { $associationElementName = "Association"; $rootSelector = "/DefaultAssociations"; $associationSelector = "./$associationElementName"; <# .SYNOPSIS Generates a selector for getting the association of the specified identifier. .PARAMETER Identifier The identifier to get the association of. #> $getSelector = { param( [string] $Identifier ) [string] $filter = ""; if ($Identifier) { $filter = "[@Identifier='$Identifier']"; } "$rootSelector/$associationSelector$filter"; }; <# .SYNOPSIS Gets the default app associations of the running Windows system. #> function Get-DefaultAppAssociations { [OutputType([xml])] param() $result = [xml]::new(); $result.LoadXml(((DISM /Online /Get-DefaultAppAssociations) | Select-Object -Skip 6 | Select-Object -SkipLast 2 | Out-String)); $result; } <# .SYNOPSIS Sets a default app association. .PARAMETER Identifier The identifier of the association to set. .PARAMETER ProgId The ProgId to set the association to. .PARAMETER ApplicationName The ApplicationName to set the association to. #> function Set-DefaultAppAssociation { param( [string] $Identifier, [string] $ProgId, [string] $ApplicationName ) [System.Xml.XmlNode] $association = $null; $document = Get-DefaultAppAssociations; $candidates = $document.SelectNodes((& $getSelector $Identifier)); if ($candidates.Count -eq 1) { $association = $candidates[0]; } else { $association = $document.SelectSingleNode($rootSelector).AppendChild($document.CreateElement($associationElementName)); foreach ($attributeName in @("Identifier", "ProgId", "ApplicationName")) { $null = $association.Attributes.Append($document.CreateAttribute($attributeName)); } $association.Identifier = $Identifier; } $association.ProgId = $ProgId; $association.ApplicationName = $ApplicationName; Save-DefaultAppAssociations $document; } <# .SYNOPSIS Saves the default app associations. .PARAMETER Document The xml document containing the declarations of the app associations. #> function Save-DefaultAppAssociations { param( [xml] $Document ) $root = $document.SelectSingleNode($rootSelector); $associations = $root.SelectNodes((& $getSelector)); # Reorder associations by their Identifier $null = $associations | ForEach-Object { $root.RemoveChild($_) } | Sort-Object -Property "Identifier" | ForEach-Object { $root.AppendChild($_) }; $configFile = New-TemporaryFile; $writerSettings = [XmlWriterSettings]::new(); $writerSettings.Indent = $true; $writerSettings.Encoding = [System.Text.UTF8Encoding]::new(); $writer = [XmlWriter]::Create($configFile.FullName, $writerSettings); $document.Save($writer); $writer.Dispose(); $null = DISM /Online "/Import-DefaultAppAssociations:$($configFile.FullName)"; Remove-Item $configFile; } }