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This info comes from this tutorial.
Theme Pack - Create, Save, Install, and Delete 1. Download and save a
.themepack file of your choice to your desktop.
NOTE: For example, the Example.themepack file used in OPTION TWO.
2. Double click on the .themepack file to install it on your computer.
NOTE: This will install the .themepack to a folder with the themepack name in the hidden C:\Users\User-Name\AppData\Local\Microsoft\Windows\Themes folder.
3. You will notice that this .themepack file is now your current theme and has been added to the Personalization window under
My Themes. (See screenshot below)
Have a look at it. Hope this helps