CHM viewer is present on pre-vista, not on Vista, but the tools needed to show HXS isn't present on pre-vista, but I gather they are on Vista.
How this ended up as a solution to any problem, I still don't know. It just works, mostly, whereas the built-in help invariably falls down to that progress bar that just locks Visual Studio until it has rebuilt the help file, except that it didn't because the files are now corrupt, so any time I hit F1, Visual Studio just locks down unless I kill the DEXPLORE program any number of times.
I still don't know if the integration works, but these days I just switch Visual Studio to use online help. You could say this is the fault of the third party installation tools, but for quite some time there was no documentation on how to do this, so they had to chose between reverse engineering it (and getting it wrong, sometimes) or not integrating at all.
I can't tell you how many times the new HXS format has completely hosed my Visual Studio help when 3rd parties integrate. There are tremendous problems with almost all the help file formats because the makers (typically Microsoft for quite a few of them) doesn't seem to want to do a job more than just slightly good enough for their own use.
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