Sample code used to extract catalog hashes from a mounted Windows image

GetCatalogHashes.ps1

# https://github.com/mattifestation/CatalogTools
Import-Module CatalogTools

# install.wim was mounted to C:\Mount with Mount-WindowsImage
$SystemCatalogEntries = ls -Path C:\Mount -Include '*.cat' -Recurse | % {
    $CatalogInfo = Get-CatalogFile -Path $_.FullName
    $FilePath = 'C:' + $CatalogInfo.FilePath.Path.Substring(8)

    $CatalogInfo.CatalogMembers | ? { $_.HashInfo.Algorithm -and $_.HashInfo.FileHash } | % {
        $Hint = $null
        
        if ($_.NameValuePairs) {
            $HintEntry = $_.NameValuePairs | ? { $_.Name -eq 'Hint' } | Select-Object -First 1

            if ($HintEntry) { $Hint = $HintEntry.Value }
        }

        [PSCustomObject] @{
            Algorithm = $_.HashInfo.Algorithm
            Hash = $_.HashInfo.FileHash
            CatalogPath = $FilePath
            Hint = $Hint
        }
    }
}