WIM stands for Windows Imaging Format. Files that have the .wim file extension contain disk images that can be mounted within the Windows operating system. These files allow a user to use the disk image on multiple computer platforms. WIM files are very similar to other disk image formats, but this file format is file-based and not and not sector-based like most disk image formats.
Windows Server 2008 and Windows Vista both use the WIM file format as a part of their installation process. The WIM file format was actually developed by Microsoft in order to deploy the Windows operating environment.
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