Article ID: 2021383 - Last Review: March 23, 2010 - Revision: 2.0

Some .CHM files may not render properly on Windows Vista and Windows 7

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Symptoms

When attempting to open a Compiled HTML Help (.CHM) file on Windows Vista or Windows 7, the file may open but display one of the following messages instead of the expected content:

Navigation to the webpage was canceled.
Action canceled.

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Cause

This will occur if the .CHM file has been flagged as downloaded from an untrusted source, such as the Internet.

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Resolution

To resolve this issue, carry out the following steps:

Right-click the .CHM file and choose Properties
On the General tab, click the button labeled "Unblock"
Click OK

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More Information

This behavior is a function of the Attachment Manager, which applies a Zone Identifier to files downloaded from any source that is considered untrusted or at risk, such as the Internet Zone.

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Note This is a "FAST PUBLISH" article created directly from within the Microsoft support organization. The information contained herein is provided as-is in response to emerging issues. As a result of the speed in making it available, the materials may include typographical errors and may be revised at any time without notice. See Terms of Use (http://go.microsoft.com/fwlink/?LinkId=151500) for other considerations.

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