微软一直以来都没有为Windows98 SE发布过任何服务包。此次在网上出现的所谓Windows98 SE SP1或SP 1.1是非官方的，它包含了从微软站点上搜集到的Windows98 SE的所有更新。
需要注意的是，该服务包只适用于Windows 98 SE的英文版用户。
其中包含如下更新：
· Added one update [Q870669] and one hotfix [Q295629 (Replaces Q258010 and Q274334)]
· Added ATL.DLL
· Updated ROOTSUPD.EXE [to 7.0]
· Updated HTML32.CNV [to Office XP SP3]
· Updated INFEX.EXE from 0.1 to 0.2
· Changed "MaxFileCache=524288" to "MaxFileCache=393216" in SPUPDATE.INF
· Changed copy method of HARDWARE.HLP in SPUPDATE.INF
· Changed copy method of Visual C++ [VCREDIST] and OLE Automation [OLEUPD] · files in SPUPDATE.INF to avoid any version inconsistency
· Added "SmartReboot=N" into the all INFs for preventing unexpected reboot messages
· Corrected typo on DELINFS.INF
· Fixed TweakUI uninstallation bug
· Fixed 98lite Sleek Notepad uninstallation bug
