Why sometimes, I can't view the content of the chm files which I downloaded? It gives me something like this when I open it.

The address is not valid

Most likely causes: There might be a typing error in the address. If you clicked on a link, it may be out of date. What you can try: Retype the address.

 Go back to the previous page.
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It should belong to superuser.com – Madhur Ahuja Dec 26 '10 at 3:04
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migrated from stackoverflow.com Dec 26 '10 at 17:48

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3 Answers

up vote 8 down vote accepted

Go To properties of file and Unblock it. Downloaded CHM files are blocked by default by Windows due to security.

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Thanks for this, I've met this sometimes when I used to use windows. – nXqd Dec 26 '10 at 17:56
Thanks a lot for this valuable help.... – Kugathasan Abimaran Jan 31 '11 at 15:14
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Right click on the file, select properties, click the "unblock" button. Screenshot here: http://www.petri.co.il/unblock-files-windows-vista.htm

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Despite the title it is xpsp2 actually – Marco van de Voort Dec 31 '10 at 21:35
Thanks a lot for the help. – Kugathasan Abimaran Jan 31 '11 at 15:15
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Sometimes if path to your CHM file is too long, a file cannot be opened properly. To check if this is a reason, just copy your file in some root folder (for example C:\ or D:\ or something similar).

Edit: The other reason is if file is blocked and it should be unblocked, of course.

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