TypeSO

Option Explicit
Public Const VER_PLATFORM_WIN32_NT = 2
Public Const VER_PLATFORM_WIN32_WINDOWS = 1
Public Const VER_PLATFORM_WIN32s = 0
Type OSVERSIONINFO
dwOSVersionInfoSize As Long
dwMajorVersion As Long
dwMinorVersion As Long
dwBuildNumber As Long
dwPlatformId As Long
szCSDVersion As String * 128
End Type
Declare Function GetVersionEx Lib "kernel32" _
Alias "GetVersionExA" (lpVersionInformation As _
OSVERSIONINFO) As Long
Public Sub Main()
Dim OS As OSVERSIONINFO
OS.dwOSVersionInfoSize = Len(OS)
GetVersionEx OS
If OS.dwMajorVersion < 4 Then
MsgBox "Impossibile continuare! _
E' richiesto Win 9x o WinNt 4.x", _
vbInformation
End
Else
Select Case OS.dwPlatformId
Case VER_PLATFORM_WIN32_WINDOWS
MsgBox "Windows 95" & Str(OS.dwMajorVersion) & _
" Build " & Str(OS.dwBuildNumber), vbInformation
Case VER_PLATFORM_WIN32_NT
MsgBox "Windows NT Versione" & Str(OS.dwMajorVersion) & _
" Build " & Str(OS.dwBuildNumber) , vbInformation
End Select
End If

End Sub
Con l'API GetVersionEx e' molto semplice rilevare il tipo
di sistemo operativo (e la sua versione). Ecco come fare: