The Windows Imaging Interface Reference describes the programmatic method for managing Windows image (.wim) files for Windows® 7. WIM is a file-based disk image format that was introduced in Windows Vista®. This documentation is only applicable to Windows 7.
The primary purpose of Imaging APIs (Wimgapi.dll) is to programmatically capture, modify, and apply images for deployment in a manufacturing or corporate IT environment. Wimgapi.dll is now included by default in Windows 7. ImageX is an implementation of the Imaging APIs.