You can convert ESD to WIM and vice versa using the built-in DISM tool. Four different compression formats can be used in DISM to compress a WIM image. For each ...
DISM++ (GUI): Convert ESD to WIM or ISO. If you don't like using command-line tools, you can use the third-party graphical tool Dism++ to convert your ESD file.
This tutorial will show how to use DISM to convert an ESD based MCT install media to WIM format. The same method can of course be used to convert any other ESD ...