AntiVir incremental VDF update (IVDF) for the version 7 The version 7 of Avira AntiVir Windows Workstation and AntiVir PersonalEdition Premium and Classic is available in two versions: one version for the use under Windows 98, 98 SE and Windows ME and the other version to be used on Windows NT, 2000 and XP that is Unicode-aware, i.e. that can recognize non Western languages and fonts (e.g. with file names and contents). The ¡°normal¡± IVDF has to be used for the version 7 on Windows 98, 98 SE and Windows ME. The IVDF (Unicode) has to be used for the ¡°Unicode¡± version 7 on Windows NT, 2000 and XP.