Sometimes users are facing issues when opening help files (compiled into CHM format) that are provided with Bentley applications. Most often these issues are related to user's environment and is not a flaw in help itself. I’ll try to cover most frequent ones in this topic.
Typically the following message is displayed:
Windows security update prevents accessing chm files over network because of vulnerability that could allow remote code execution.
The message contains the following:
"Cannot open the file: mk:@MSITStore: C:\Program Files (x86)\Bentley\MicroStation V8i (SELECTseries)\MicroStation\readme_MicroStation.chm".
A key in this message is "mk:@MSITStore" phrase. This solution may not apply if you get a different error type.
The Microsoft Help system is damaged. Typically it's hard to identify specific causes, but most often it is because of third party installers that either deploy older versions of Help components or fail to register them properly.
This is caused by incorrect .htm and .html filetype information in system's registry. Microsoft's HTML Help components will go wrong if a particular registry value is set incorrectly. Also you may notice that only some chm files are displayed incorectly, however other help files are working fine. It might happen if default browser was changedfrom Firefox/chrome to Internet Explorer or the other way around.