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UrlAllowList does not work when opening helpfile from .NET app

Background:

Since Microsoft’s security update 896358, security update 840315 or Windows
Server 2003 Service Pack 1, you can not longer open and see topic content in
help files on the network. This is true even for files in shared folders on
local intranet and even if the user has enough previliges to open the help
file it self. This is because help files indirectly could open active content
that is placed in some other unsecure location.

However, there is two known workarounds for this problem. One is to set the
MaxAllowedZone under the HTMLHelp\ItssRestrictions key in local registry.

Problem:

When launching a HTMLHelp file through .NET code and the Help.ShowHelp
method and setting the MaxAllowZone = 1, all works fine. But when using
UrlAllowList this does not work. But when opening helpfile directly from
Windows UrlAllowList all works fine.

Why doesn't UrlAllowList work from .NET app?

Apr 20 '07 #1
0 1696

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