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Just to add that I believe you're right as far as the XP vs. Vista issue is concerned. There shouldn't be any difference between these two operating systems in the way they handle remotely accessed help files.
If we assume that the same registry changes have been made to all four of your machines, there are at least two reasons why the contents of remote help files may be viewable from one machine but not from another.
- If IE7 is installed, and you have set the
MaxAllowedZone registry key to 1 so that you can view the
contents of all help files in the Local Intranet zone, you must
also make an additional change to the Internet options in IE before
you can access the help files. See this article for more
This additional change was unnecessary in IE6 and earlier. Perhaps the version of IE is a factor in your case?
UrlAllowList registry key, which is designed to let you view
the help files in specific network folders only, was reportedly
broken for quite a long period. This was eventually fixed by a
Microsoft update last year, but machines that haven't been updated
for some time may still exhibit the problem. See:
For some reason your links aren't working.
They work for me. Try again.
As an update:
A co-worker of mine discovered a file named "HTMLHelp.reg" that is on some of our systems, but not all.
If you have this file, it seems that you can view .chm files over a network. If you don't, you can't. Unfortunately he is out at the moment and I can't find where this file is supposed to be in Vista.
He found it in an XP machine and copied it to Vista, where it appears to work. What's odd is that several of our new Vista machines allow us to view .chm files over a network right "out of the box", without any changes or updates made to the registry or elsewhere, or AFAIK without this file being specifically added or altered.
Anyone familiar with where to find this file in Vista? We are now trying to see if we can view chm files from SharePoint (even machines with the above file cannot view chm files opened directly from SharePoint).
> What's odd is that several of our new Vista machines allow us to view .chm
> files over a network right "out of the box", without any changes or
> updates made to the registry or elsewhere, or AFAIK without this file
> being specifically added or altered.
That's certainly odd. If you open Registry Editor and navigate to the following key, is there nothing there that might permit you to view remotely-accessed .chm files?
I'd expect to find a UrlAllowList or MaxAllowedZone value that unblocks the remote .chm files in specified nework folders or security zones. In the absence of these values, viewing remote files should be impossible.
> Anyone familiar with where to find this file in Vista?
It wouldn't be shipped with Vista, as by making the registry changes you're relaxing the security of your PC and potentially exposing it to attacks from malware writers — not something that Microsoft could ever be seen to encourage.
> even machines with the above file cannot view chm files opened directly
> from SharePoint
Yes, that's right. The same security update is responsible for both issues, but each issue has its own set of workarounds.