While modern Windows 10 and 11 offer language packs directly through the menu, the CAB file is necessary in specific scenarios:

It is most commonly used in scenarios where a computer was originally installed with a different language (e.g., German, Chinese, or French), and the user wishes to switch the primary interface to English.

He leaned back in his chair, the hum of the servers returning to a normal pitch. The .cab file was gone. But in the deepest log file, timestamped 3:47:01 AM, one line remained:

: It is often paired with other components, such as basic typing, speech recognition, and handwriting recognition, to provide a complete localized experience. How to Install for Personal Use

Once the process completes, you may need to restart your computer.