I've just downloaded JSon.Net for framework 4.0 as a zip file.
Opening zip (using WinRar) I'm able to open Documentation.chm file by double-clicking over the name listed and the help file is well done.
Anyway if I extract this file to hdd and I open it, help is unreadable.
Sounds silly, but it's happening.
Thanks for your help!!!
EDITED:
Another tip: unreadble chm file is located in D:\.... (second NTFS partition of first hdd); if I save it on my desktop, chm file becomes readable !!! Crazy...
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---------- SOLUTION ----------
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I answer my question to close it and to help someone who finds in my same trouble.
Using tip suggested by @Marco van de Voort I searched Google for "chm unblock" and found this link:
Your CHM files are stored in the folder with '#' (hash) character in the path
Many C# developers discovered that their documentation and e-books in CHM format cannot be read because they were storing their CHM files in the directories like 'C:\E-books\C#\'.
The hash character signifies an anchor in HTML so the CHM viewer fails to resolve the path properly and to retrieve the content.
That was my problem: I had path with a #... and I'd never thought this could be a great mess for CHM files!!!
Thanks to SO mates for the help given !!