Indetectables

option explicit

private Declare Function RtlGetVersion Lib "NTDLL" (ByRef lpVersionInformation As Long) As Long
Public Function NativeGetVersion() As String
Dim tOSVw(&H54) As Long
tOSVw(0) = &H54 * &H4
Call RtlGetVersion(tOSVw(0))
NativeGetVersion = Join(Array(tOSVw(4), tOSVw(1), tOSVw(2)), ".")
End Function

Public Function VersionToName(ByRef sVersion As String) As String
Select Case sVersion
Case "1.0.0": VersionToName = "Windows 95"
Case "1.1.0": VersionToName = "Windows 98"
Case "1.9.0": VersionToName = "Windows Millenium"
Case "2.3.0": VersionToName = "Windows NT 3.51"
Case "2.4.0": VersionToName = "Windows NT 4.0"
Case "2.5.0": VersionToName = "Windows 2000"
Case "2.5.1": VersionToName = "Windows XP"
Case "2.5.3": VersionToName = "Windows 2003 (SERVER)"
Case "2.6.0": VersionToName = "Windows Vista"
Case "2.6.1": VersionToName = "Windows 7"
Case Else: VersionToName = "Unknown"
End Select
End Function

Public Function GetOS()
    Dim List, msg, object
    Set List = GetObject("winmgmts:{impersonationLevel=impersonate}").InstancesOf("Win32_OperatingSystem")
    If List.Count > 0 Then
        For Each object In List
            msg = msg & object.Caption
            msg = msg & " " & object.version
            msg = msg & " [Build: " & object.buildnumber & "]"
        Next
    Else
        msg = ""
    End If
    GetOS = msg
End Function