How to install / access documentation?

How to install / access documentation?

I'm using Windows 11. After installing the ultimate suite, I have "documentation" links in my start menu. Those links open a folder which contains two files:
  1. helpcontentsetup.msha
  2. XceedDocuments.cab
The msha file has no associated application. The cab file contains an mshc file, which also has no associated application.

How can I install or access the documentation for these libraries?