It is amazing how some vendors of libraries in the automation industry still require you to read help files in the old Microsoft hlp format.  Trying to open such a file results EDGE to show you the following screen.

If you think you can download and install the version for Windows 8.1. you are wrong. But do not throw away your downloaded MSU-File (for Windows 8.1 x64 the name isWindows8.1-KB917607-x64.msu).

Start your command prompt as Administrator!

First extract the content of the MSU File to another directory:

md ContentMSU
expand Windows8.1-KB917607-x64.msu /F:* .\ContentMSU

Now we can extract the contained CAB-File:

This will extract 279 files.  Depending on your culture and language settings we need to locate the right MUI-File. My language is german so I use “de-”. English folk use “en-“.

cd ContentCAB
dir amd64*de-*.
People who use the x86 variant need to run “dir x86*de-*.”
Navigate to the given path, in my case
cd amd64_microsoft-windows-winhstb.resources_31bf3856ad364e35_6.3.9600.20470_de-de_1ab8cd412c1028d0

Here we will find “winhlp32.exe.mui”. We need to replace %SystemRoot%\de-de\winhlp32.exe.mui with our new file:

cd ..