Windows 8.1 Data usage

Question

The WinSXS folder on my PC currently holds over 6.9GB of data, which is a few hundred files inside the folder named like amd64microsoft-******.

I have read, and read but just can’t seem to find an trustworthy answer on the following questions:

• What does MRT.exe do?

Answer 1

Clean Up the WinSxS Folder:

Windows 8.1 and Windows Server 2012 R2 automatically reduces the size of the WinSxS...

The StartComponentCleanup task was created in Windows 8 to regularly clean up components automatically when the system is not in use. This task is set to run automatically when triggered by the operating system. When run automatically, the task will wait at least 30 days after an updated component has been installed before uninstalling the previous versions of the component.
If you choose to run this task, the task will have a 1 hour timeout and may not completely clean up all files...

The StartComponentCleanup task can also be started from the command line:

schtasks.exe /Run /TN "\Microsoft\Windows\Servicing\StartComponentCleanup"

MRT.exe (Windows Malicious Software Removal Tool)

The Microsoft Windows Malicious Software Removal Tool helps remove malicious software from your computers that are running Windows 10 Technical Preview, Windows 8.1, ...

Microsoft releases a new version of the Microsoft Malicious Software Removal Tool every month. After you download the tool, the tool runs one time to check your computer for infection by specific prevalent malicious software (including Blaster, Sasser, and Mydoom) and helps remove any infection it finds.

Next commands could help as well: where mrt, mrt /?, mrt. The last (mrt with no line parameter) launches the Malicious Software Removal Tool graphical user interface which could be informative enough...