version de windows.... Como?? :S

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Busca "GetVersion", "GetVersionEx" o ejecuta "winver"


Edito;

Código Delphi [-]
procedure TForm1.Button1Click(Sender: TObject);
var
 Size: Cardinal;
 hKey: Windows.HKEY;
 Buffer: ShortString;
begin
 Size := SizeOf(Buffer);
 RegOpenKey(HKEY_LOCAL_MACHINE, 'software\microsoft\windows nt\currentversion', hKey);
 RegQueryValueEx(hKey, 'productname', nil, nil, @Buffer, @Size);
 RegCloseKey(hKey);
 ShowMessage(string(PChar(@Buffer)));
end;