CHM refuses to open from some folders



As an IT administrator, it is important to understand why certain file types might not open from certain folders. This is especially true when it comes to the Hypertext Markup Language Compiled Help (CHM) file type, which is used to store help files for many Microsoft Windows applications.

When attempting to open a CHM file, it is possible that Windows may prevent it from opening due to security settings or permissions. In such cases, users will be presented with an error message stating that the file “cannot be opened” or “access denied.” This can be a frustrating experience for users, and it is important for administrators to understand the cause of the issue and how to fix it.

The cause of this issue is that Windows prevents CHM files from being opened when they are stored in certain locations. Windows does this in order to protect users from malicious software that could be hidden in a CHM file. The locations where Windows will block CHM files from being opened include:

• Network shares

• Web-based folders

• Removable devices

• Compressed (ZIP) files

• Temporary internet files

• Folders marked as “restricted”

• Any other locations that may be blocked by the Windows Security settings

In order to open a CHM file from one of these locations, the Windows security settings must be changed to allow the file to be opened. To do this, open the Control Panel and go to the “Security and Maintenance” section. Then, select the “Change Windows Security Settings” option.

In the window that appears, select the “Allow files from potentially unsafe locations” option. This will allow files from these locations to be opened. Note that this setting should only be enabled if the user trusts the source of the CHM file.

After making this change, the user should be able to open CHM files from the locations mentioned above. However, it is important to note that this setting should only be enabled if the user trusts the source of the CHM file.

In summary, Windows can prevent certain CHM files from being opened due to security settings or permissions. In order to open these files, the Windows security settings must be changed to allow the file to be opened. This should only be done if the user trusts the source of the CHM file. Once the setting is enabled, the user should be able to open CHM files from the locations mentioned above.

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