When changing the item's modification date through this property, the physical item is immediately modified if it exists. If it does not exist, the date is cached and will be applied whenever this item is created.
Setting the LastWriteDateTime of an encrypted file does nothing. The date is left unaffected and no exception is thrown, for performance reasons, when copying many files to an encrypted zip file.
Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2