OSVersion

1.6.1

OSVersion.Windows.ps1

<#
    Get Windows OS version
#>
function GetWindowsVersion () {
    $cimInfo = GetCimVersionInfo
    $ProductType_WorkStation = 1; # see : https://msdn.microsoft.com/en-us/library/aa394239.aspx

    # see : http://www.atmarkit.co.jp/ait/articles/1707/31/news028.html
    $osDistro = [OSVersion.Distributions]::Unknown
    $majorVer, $minorVer, $buildVer = 0, 0, 0
    switch ($cimInfo.Version.Major) {
        10 {
            # Windows 10
            if ($cimInfo.ProductType -eq $ProductType_WorkStation) {
                $osDistro = [OSVersion.Distributions]::Windows
                $majorVer = 10
                $minorVer = switch ($cimInfo.Version.Build) {
                    {$_ -gt 19042} { 9999; break } # next Release
                    19042 { 2010; break }          # October 2020 Update (20H2)
                    19041 { 2004; break }          # May 2020 Update
                    18363 { 1909; break }          # November 2019 Update
                    18362 { 1903; break }          # May 2019 Update
                    17763 { 1809; break }          # October 2018 Update
                    17134 { 1803; break }          # Spring Creators Update
                    16299 { 1709; break }          # Fall Creators Update
                    15063 { 1703; break }          # Creators Update
                    14393 { 1607; break }          # Anniversary Update
                    10586 { 1511; break }          # November Update
                    Default { 1507; break }        # Initial release
                }
                $buildVer = 0
                break
            }
            # Windows Server LTSC / Windows Server SAC
            switch ($cimInfo.Version.Build) {
                {$_ -gt 19042} {
                    # Windows Server next version
                    $osDistro = [OSVersion.Distributions]::WindowsServerSAC
                    $majorVer, $minorVer, $buildVer = 9999, 1, 0
                    break
                }
                19042 {
                    # Windows Server 20H2
                    $osDistro = [OSVersion.Distributions]::WindowsServerSAC
                    $majorVer, $minorVer, $buildVer = 2010, 1, 0
                    break
                }
                19041 {
                    # Windows Server 2004
                    $osDistro = [OSVersion.Distributions]::WindowsServerSAC
                    $majorVer, $minorVer, $buildVer = 2004, 1, 0
                    break
                }
                18363 {
                    # Windows Server 1909
                    $osDistro = [OSVersion.Distributions]::WindowsServerSAC
                    $majorVer, $minorVer, $buildVer = 1909, 1, 0
                    break
                }
                18362 {
                    # Windows Server 1903
                    $osDistro = [OSVersion.Distributions]::WindowsServerSAC
                    $majorVer, $minorVer, $buildVer = 1903, 1, 0
                    break
                }
                17763 {
                    # Windows Server 2019 / Windows Server 1809
                    if ($cimInfo.Caption.Contains('2019')) {
                        # Windows Server 2019
                        $osDistro = [OSVersion.Distributions]::WindowsServer
                        $majorVer, $minorVer, $buildVer = 2019, 1, 0
                    } else {
                        # Windows Server 1809
                        $osDistro = [OSVersion.Distributions]::WindowsServerSAC
                        $majorVer, $minorVer, $buildVer = 1809, 1, 0
                    }
                    break
                }
                17134 {
                    # Windows Server 1803
                    $osDistro = [OSVersion.Distributions]::WindowsServerSAC
                    $majorVer, $minorVer, $buildVer = 1803, 1, 0
                    break
                }
                16299 {
                    # Windows Server 1709
                    $osDistro = [OSVersion.Distributions]::WindowsServerSAC
                    $majorVer, $minorVer, $buildVer = 1709, 1, 0
                    break
                }
                Default {
                    # Windows Server 2016 (Build 14393)
                    $osDistro = [OSVersion.Distributions]::WindowsServer
                    $majorVer, $minorVer, $buildVer = 2016, 1, 0
                    break
                }
            }
            break
        }
        6 {
            switch ($cimInfo.Version.Minor) {
                3 {
                    # Windows 8.1
                    if ($cimInfo.ProductType -eq $ProductType_WorkStation) {
                        $osDistro = [OSVersion.Distributions]::Windows
                        $majorVer, $minorVer, $buildVer = 8, 1, 0
                        break
                    }
                    # Windows Server 2012 R2
                    $osDistro = [OSVersion.Distributions]::WindowsServer
                    $majorVer, $minorVer, $buildVer = 2012, 2, 0
                    break
                }
                2 {
                    # Windows 8
                    if ($cimInfo.ProductType -eq $ProductType_WorkStation) {
                        $osDistro = [OSVersion.Distributions]::Windows
                        $majorVer, $minorVer, $buildVer = 8, 0, 0
                        break
                    }
                    # Windows Server 2012
                    $osDistro = [OSVersion.Distributions]::WindowsServer
                    $majorVer, $minorVer, $buildVer = 2012, 1, 0
                    break
                }
                1 {
                    # Windows 7
                    if ($cimInfo.ProductType -eq $ProductType_WorkStation) {
                        $osDistro = [OSVersion.Distributions]::Windows
                        $majorVer = 7
                        $minorVer = 0
                        $buildVer = switch ($cimInfo.Version.Build) {
                            7601 { 1; break }    # Windows 7 SP1
                            7600 { 0; break }    # Windows 7
                            Default { 0; break } # Windows 7
                        }
                        break
                    }
                    # Windows Server 2008 R2
                    $osDistro = [OSVersion.Distributions]::WindowsServer
                    $majorVer = 2008
                    $minorVer = 2
                    $buildVer = switch ($cimInfo.Version.Build) {
                        7601 { 1; break }    # Windows Server 2008 R2 SP1
                        7600 { 0; break }    # Windows Server 2008 R2
                        Default { 0; break } # Windows Server 2008 R2
                    }
                    break
                }
                0 {
                    # Vista
                    if ($cimInfo.ProductType -eq $ProductType_WorkStation) {
                        $osDistro = [OSVersion.Distributions]::Windows
                        $majorVer = 6
                        $minorVer = 0
                        $buildVer = switch ($cimInfo.Version.Build) {
                            6002 { 2; break }    # Vista SP2
                            6001 { 1; break }    # Vista SP1
                            Default { 0; break } # Vista
                        }
                        break
                    }
                    # Windows Server 2008
                    $osDistro = [OSVersion.Distributions]::WindowsServer
                    $majorVer = 2008
                    $minorVer = 1
                    $buildVer = switch ($cimInfo.Version.Build) {
                        6002 { 2; break }    # Windows Server 2008 SP2
                        6001 { 1; break }    # Windows Server 2008 SP1
                        Default { 0; break } # Windows Server 2008
                    }
                    break
                }
            }
        }
        Default {
            # Unknown Windows
            $osDistro = if ($cimInfo.ProductType -eq $ProductType_WorkStation) {
                [OSVersion.Distributions]::Windows
            } else {
                [OSVersion.Distributions]::WindowsServer
            }
            $osVersion = $cimInfo.Version
            break
        }
    }
    $osVersion = New-Object 'System.Version' -ArgumentList @($majorVer, $minorVer, $buildVer)

    return New-Object 'OSVersion.OSVersionInfo' -ArgumentList @($osDistro, $osVersion, $cimInfo.Caption)
}

function GetCimVersionInfo () {
    try {
        return Get-CimInstance -ClassName Win32_OperatingSystem -Property Version, ProductType, Caption `
            | ForEach-Object { [PSCustomObject]@{ Version = [Version]$_.Version; ProductType = $_.ProductType; Caption = $_.Caption } }
    } catch {
        return Get-WmiObject -Class Win32_OperatingSystem -Property Version, ProductType, Caption `
            | ForEach-Object { [PSCustomObject]@{ Version = [Version]$_.Version; ProductType = $_.ProductType; Caption = $_.Caption } }
    }
}