Windows 98 build 1397

Windows 98 build 1397 is a build of Windows 98 that is referenced in the file  from builds 1400-1434. These suggest build 1398 may have been the first to feature some of the new shell changes observed in the next publicly available build (1400).

RELNOTES.RTF
If you are using a build of Memphis greater than 1397 (or otherwise using Internet Explorer 4), you MUST do the following:  Change the Shell to “Windows Classic Shell” on the appearances tab of the desktop control panel (or if using IE4, go to add/remove programs control panel and remove web view integration) BEFORE installing Memphis WinHEC Developer Release. If you do not do this, you will not have a working Internet Explorer Browser after the upgrade.