In attached ZIP's there are SVCPACK.INF and HFSLIP.CMD from another files set, not the same with my first post, but the situation is identical - bug presents only in distributive made by 1.7.2. I compared files in pares, here is differences: SVCPACK.INF 1.7.0 1.7.2 ....................................................................... kb941569.cat KB942615-IE7.CAT KB942615-IE7.CAT KB942763.CAT ....................................................................... There are the same set of KB's and the same source in HFslip folders for both processing - by 1.7.0 and by 1.7.2 HFSLIP.CMD 1.7.0 1.7.2 ........................................................................ IF EXIST %SYSTEMROOT%\HFSLIP.TMP GOTO :PART2 ECHO/>%SYSTEMROOT%\HFSLIP.TMP ......................................................................... GOTO :EOF :PART2 .......................................................................... rundll32.exe advpack.dll,LaunchINFSection rundll32.exe advpack.dll,LaunchINFSection %SYSTEMROOT%\HFSLIP\HFSLPGUI.INF,HFSLIPGUI %SYSTEMROOT%\HFSLIP\HFSLPGUI.INF,HFSLIPGUI_Run .......................................................................... Strings for MSHTML.DLL are identical in both HFSLIP.CMD I have no time for code analyzis now, but these differences don't seems so critical, IMHO, bug is elsewhere... PS: One question - why HFSLIP.CMD repeats twice in the end of SVCPACK.INF? 1.7.0.zip 1.7.2.zip