Would be nice to see this in a future version.
"The Windows Imaging Format (WIM) is a file-based disk image format. It was developed by Microsoft for use in its upcoming operating system releases. Windows Vista and Windows Fundamentals for Legacy PCs use it as part of their installation procedure."
"Like other disk image formats, a WIM file contains a set of files and associated filesystem information. However, unlike sector-based formats (such as .ISO, .CUE/.BIN used for CD and DVD images), WIM is file-based, which means that the smallest unit of information is a file. The advantages of it being file-based include hardware independence, the ability to use heavy compression, and unique storage of a file referenced multiple times in the filesystem tree (single instance storage). It also allows packing multiple image files into only one file."