Files that contain the .clg file extension are most commonly used by the Windows System Image Manager for SIM catalog files. These files contain details about the contents of a Windows System Image Manager image file.
A CLG file can include a variety of information about the contents of a Windows System Image Manager image, including details about the state of the packages and components that are used display the contents of an associated WIM file. The WIM files contain the actual image data. The CLG files contain the WIM file's catalog data.
These files are usually included with a user's Windows installation discs.
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