CHM file unreadble if saved to hdd

Question

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 !!

Answer 1

Windows keeps track of downloaded files on NTFS systems, and puts certain restrictions on them. If you extract with windows explorer, this status propagates from archive to file. Using a third party tool (winrar in your case, I use INFO zip) can circumvent this.

Some descriptions and other links can be found

http://wiki.lazarus.freepascal.org/chm_backend_for_fpdoc#Troubleshooting

Free Pascal (2.4.4) has some tool to unlock them. (chmls unblock). It is done by truncating an alternate filestream (therefore it only works with NTFS). I found this info somewhere on stackoverflow, but can't quickly find the link.

It might be that virtual folders like desktop don't fully support this.

Answer 2

maybe the references to some content is to web or no chm file. maybe if you can disassamble in CHM editor and change paths can fix it.

maybe this can help you

Answer 3

There are security permissions applied to this file type by a recent patch.

you need to unblock the file: http://www.helpscribble.com/chmnetwork.html

Answer 4

instead of thinking many possibilities of "windows security permission", get a CHM reader or wrap your CHM using winrar, and doubleclick to view it like you did.

It's save your time a lot!!

So, two simple solutions are:

1. have a CHM reader: https://blog.kowalczyk.info/articles/chm-reader-viewer-for-windows.html

2. OR right click CHM file/s, > Add to RAR Archive. If you want to read it, double click RAR file > double click CHM file. BINGO!!