Built a help file (.CHM) which works fine on local machine but not from network share

I recently started noodling around with SandCastle and Doc Project to build help files from my .net solutions.  After some experiments and research,  I am now able to buil MS Style help for my projects which is great.  So in comes Microsoft Security updates and I cannot launch the .CHM file from a network share.  The .chm only launches correctly from my local pc.

I have tried registering, looking some unblock button to appear on a warning dialog (it is not there on my pc), playing assorted junk in my registry based on recommendations,  but still the help file does not launch the help.
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Howard BashSenior Software EngineerAsked:
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help-infoCommented:
seems you have all done ..

You know - in a connected world security updates are now a fact of life. Get used to them. Microsoft have done a mighty job of securing Windows starting with XP SP2 released in Aug 2004. Since then a string of updates have reduced the humble CHM to the status of a humble local help system. It's a shame but we need to move on.

EC-Software released a updated freeware utility to edit the registry settings. Expanding the "MaxAllowedZone" is one option to enable CHM files over the network, but you can also register individual files or folders. "HHReg" does the registry editing job and lets you comfortably register individual CHM files and/or folders. System administrators can run it in batch mode as well.

Product link and download:
http://www.ec-software.com/products_hhreg.html 
HHReg is free for personal and commercial use.

See also (and blog comments of this thread too):
http://weblog.helpware.net/?p=50 

A additional links:
http://tinyurl.com/2rqy8l

HTH
Ulrich
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