Whether you have downloaded the Windows 7 localization packs (LocalPacks) in ISO, IMG or standalone update package in .CAB format, which is a cabinet file that contains the update package for regional theme, wallpapers, RSS feeds and Favorites links. The .CAB cabinet file for localization customization cannot be installed via desktop GUI of Windows 7, and must be installed with the DISM, a command-line tool for Windows 7 and Windows Server 2008 R2.

Deployment Image Servicing and Management (DISM) consolidates the core image management functions of multiple tools found in the Windows Automated Installation Kit (AIK) and enables IT professionals to view components of an applied or mounted operating system image and add or remove packages, software updates, and drivers. In order to use DISM to install Windows 7 local packs, follow these steps:

1. Extract the .CAB file from the LocalPacks ISO or IMG image. If you are already holding a .CAB cabinet file, skip this step.
2. Open a command prompt with administrator’s privileges, and run and execute the following command:

DISM /Online /Add-Package /PackagePath:"<drive>:\<path\to>\Windows-LocalPack-<XX>-Package.cab"

Replace parameter in < and > brackets with actual path to the CAB file. For example,

For %%A In (*.cab) Do Start /Wait pkgmgr /ip /m:%%A /quiet /norestart