Windows Server Installed Programs List & Software Inventory Report – PowerShell HTML Script

# ==========================================
# Installed Software Audit Report (HTML)
# Read-only / Non-destructive
# ==========================================

$OutputDir  = "C:\Temp"
$OutputHtml = Join-Path $OutputDir "Installed_Software_Audit.html"

if (!(Test-Path $OutputDir)) {
    New-Item -ItemType Directory -Path $OutputDir | Out-Null
}

function Resolve-SIDToUser {
    param([System.Security.Principal.SecurityIdentifier]$Sid)

    if ($null -eq $Sid) { return $null }

    try {
        return $Sid.Translate([System.Security.Principal.NTAccount]).Value
    }
    catch {
        try { return $Sid.Value } catch { return $null }
    }
}

# Registry uninstall paths
$uninstallPaths = @(
    "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\*",
    "HKLM:\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Uninstall\*"
)

# Installed software list
$programs = foreach ($path in $uninstallPaths) {
    Get-ItemProperty $path -ErrorAction SilentlyContinue | Where-Object {
        $_.DisplayName -and $_.DisplayName.Trim() -ne ""
    } | Select-Object `
        @{Name='DisplayName';Expression={$_.DisplayName}},
        @{Name='DisplayVersion';Expression={$_.DisplayVersion}},
        @{Name='Publisher';Expression={$_.Publisher}},
        @{Name='InstallDateRaw';Expression={$_.InstallDate}},
        @{Name='InstallLocation';Expression={$_.InstallLocation}},
        @{Name='UninstallString';Expression={$_.UninstallString}},
        @{Name='RegistryPath';Expression={$_.PSPath}}
}

# Normalize InstallDate
$normalizedPrograms = foreach ($p in $programs) {
    $installDate = $null

    if ($p.InstallDateRaw -match '^\d{8}$') {
        try {
            $installDate = [datetime]::ParseExact($p.InstallDateRaw, 'yyyyMMdd', $null)
        }
        catch {
            $installDate = $null
        }
    }

    [PSCustomObject]@{
        DisplayName      = $p.DisplayName
        DisplayVersion   = $p.DisplayVersion
        Publisher        = $p.Publisher
        InstallDate      = $installDate
        InstallLocation  = $p.InstallLocation
        UninstallString  = $p.UninstallString
        RegistryPath     = $p.RegistryPath
    }
}

# MSI Installer events (if present in retained logs)
try {
    $msiEvents = Get-WinEvent -FilterHashtable @{
        LogName      = 'Application'
        ProviderName = 'MsiInstaller'
        Id           = 1033, 11707
    } -ErrorAction Stop | Select-Object TimeCreated, Id, ProviderName, Message, UserId
}
catch {
    $msiEvents = @()
}

# Correlate programs with MSI events
$result = foreach ($prog in ($normalizedPrograms | Sort-Object DisplayName, InstallDate -Unique)) {

    $matchedEvent = $null
    $matchedUser  = $null

    if ($prog.InstallDate) {
        $dayStart = $prog.InstallDate.Date
        $dayEnd   = $prog.InstallDate.Date.AddDays(1)

        $candidateEvents = $msiEvents | Where-Object {
            $_.TimeCreated -ge $dayStart -and $_.TimeCreated -lt $dayEnd -and
            $_.Message -like "*$($prog.DisplayName)*"
        }

        if (-not $candidateEvents -and $prog.DisplayName) {
            $firstWord = ($prog.DisplayName -split '\s+')[0]
            if ($firstWord) {
                $candidateEvents = $msiEvents | Where-Object {
                    $_.TimeCreated -ge $dayStart -and $_.TimeCreated -lt $dayEnd -and
                    $_.Message -like "*$firstWord*"
                }
            }
        }

        if (-not $candidateEvents -and $prog.Publisher) {
            $pubWord = ($prog.Publisher -split '\s+')[0]
            if ($pubWord) {
                $candidateEvents = $msiEvents | Where-Object {
                    $_.TimeCreated -ge $dayStart -and $_.TimeCreated -lt $dayEnd -and
                    $_.Message -like "*$pubWord*"
                }
            }
        }

        $matchedEvent = $candidateEvents | Sort-Object TimeCreated | Select-Object -First 1

        if ($matchedEvent) {
            $matchedUser = Resolve-SIDToUser -Sid $matchedEvent.UserId
        }
    }

    [PSCustomObject]@{
        ServerName      = $env:COMPUTERNAME
        DisplayName     = $prog.DisplayName
        DisplayVersion  = $prog.DisplayVersion
        Publisher       = $prog.Publisher
        InstallDate     = if ($prog.InstallDate) { $prog.InstallDate.ToString("yyyy-MM-dd") } else { "" }
        InstalledBy     = $matchedUser
        EventTime       = if ($matchedEvent) { $matchedEvent.TimeCreated.ToString("yyyy-MM-dd HH:mm:ss") } else { "" }
        EventID         = if ($matchedEvent) { $matchedEvent.Id } else { "" }
        InstallLocation = $prog.InstallLocation
        UninstallString = $prog.UninstallString
        RegistryPath    = $prog.RegistryPath
    }
}

# Deduplicate final list by software/version/publisher/install date
$result = $result |
    Sort-Object DisplayName, DisplayVersion, Publisher, InstallDate -Unique

# Summary
$reportDate = Get-Date -Format "yyyy-MM-dd HH:mm:ss"
$totalCount = ($result | Measure-Object).Count
$withUser   = ($result | Where-Object { $_.InstalledBy -and $_.InstalledBy.Trim() -ne "" } | Measure-Object).Count

# HTML Style
$style = @"
<style>
body {
    font-family: Segoe UI, Arial, sans-serif;
    font-size: 12px;
    color: #222;
    margin: 20px;
}
h1, h2, h3 {
    color: #1f4e79;
}
table {
    border-collapse: collapse;
    width: 100%;
    table-layout: auto;
}
th, td {
    border: 1px solid #d9d9d9;
    padding: 6px 8px;
    vertical-align: top;
    text-align: left;
    word-wrap: break-word;
}
th {
    background-color: #1f4e79;
    color: white;
    position: sticky;
    top: 0;
}
tr:nth-child(even) {
    background-color: #f7f9fc;
}
.summary {
    margin-bottom: 20px;
    padding: 12px;
    background: #eef4fb;
    border: 1px solid #c7d7ea;
}
.note {
    margin-top: 15px;
    padding: 10px;
    background: #fff8e1;
    border: 1px solid #f0d58c;
}
.small {
    font-size: 11px;
    color: #555;
}
</style>
"@

# HTML Header / Summary
$preContent = @"
<h1>Installed Software Audit Report</h1>
<div class='summary'>
    <b>Server Name:</b> $env:COMPUTERNAME<br>
    <b>Report Date:</b> $reportDate<br>
    <b>Total Software Count:</b> $totalCount<br>
    <b>Entries with InstalledBy Detected:</b> $withUser
</div>

<div class='note'>
    <b>Note:</b> InstalledBy field may be blank for non-MSI installations, software deployed by SCCM/Intune/GPO/service accounts,
    or when relevant event logs are no longer retained on the server.
</div>
<br>
"@

# Generate HTML
$result |
    Sort-Object InstallDate, DisplayName |
    ConvertTo-Html -Head $style -PreContent $preContent -Title "Installed Software Audit Report" |
    Out-File -FilePath $OutputHtml -Encoding UTF8

Write-Host "HTML rapor oluşturuldu: $OutputHtml" -ForegroundColor Green