In response to increasing security problems
involving Help files (.CHM extension), Microsoft recently introduced Security
Update 896358. The security update prevents CHM files from opening unless those
files reside locally on the user's hard drive. After the update is installed,
users who access MASC from a server or
network location will not be able to open the Help and will receive the messages
"Action canceled" or "The page cannot be
displayed".
To alleviate this issue, please refer to Microsoft
Knowledge Base ID 896054, below. We have tested this solution and recommend that
you use Method 1: Modify the ItssRestrictions registry entry to enable a
specific Web application, which is located under the Consumers and
non-enterprise customers section of the article:
1. Click Start,
click Run, type regedit, and then click OK.
2.
Locate and then click the following subkey:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\HTMLHelp\1.x\ItssRestrictions
Note: If this registry subkey does not exist, create it. To do
this, follow these steps:
a. On the Edit menu, point to New,
and then click Key.
b. Type ItssRestrictions, and then press
[ENTER].
3. Right-click the ItssRestrictions subkey, point to
New, and then click String Value.
4. Type
UrlAllowList, and then press [ENTER].
5. Right-click the
UrlAllowList value, and then click Modify.
6. In the
Value data box, type the path to the application that you want to enable,
and then click OK.
Notes:
• Entries in the
UrlAllowList value are separated by a semicolon.
• If you access
the application through a UNC path, you must add two entries corresponding to
the UNC path, as in the following examples:
For MASC:
\\servername\PathToMASC\;file://\\servername\PathToMASC
Note: In the
example above, use the word "file"; do not substitute a
filename.
• Or, if you access the application through a mapped
drive, you must add two entries corresponding to the drive letter, as in the
following examples:
For MASC:
driveletter:\PathToMASC\;file://driveletter:\PathToMASC
7. Quit
Registry Editor.
8. Re-start MASC.