Theme Packs (.themepack files) are typically installed in two (2) locations.
[Note:] To view the directory of Theme Packs installed by Users, you must configure Windows to "Show Hidden Files"
Show Hidden Files
https://support.microsoft.com/en-us/help/14201/windows-show-hidden-files
[Windows 7]
[Note:]
- I expect that this will be similar for Windows 8.0, 8.1 and 10 but some folders for Windows 10 my be set as Read Only; however, you should be able to copy to them.
- Be careful attempting to use "Change Ownership" of files and folders.
User installed Theme Packs**:**
C:\Users*UserAcct*\AppData\Local\Microsoft\Windows\Themes
[Where UserAcct is the name of the current user that is logged into Windows.]
Theme Packs for All Users**:**
To make Theme Packs available for All Users, store Theme Packs Here:
C:\Windows\Resources\Themes
Additional Reference:
Creating and Installing Theme Files
Theme File Format
https://msdn.microsoft.com/en-us/library/windows/desktop/bb773190(v=vs.85).aspx
Windows 10 Theme Packs
(Compatible with the "new windows")
https://support.microsoft.com/en-us/help/14027