CaptureMsd is a tool that is part of the Hardware Independent Imaging package. In combination with another rool called InjectMsd, it allows a a new mass storage driver to be injected into an existing image. The most common use case is - take an existing image created on an IDE based machine and deploy it to a SATA based machine.
Attached is CaptureMsd.exe V1.1. It fixes a problem whereby you would get an error message "Devicepath is empty" if the DevicePath key in the registry (HKLM\Software\Microsoft\Windows\CurrentVersion\DevicePath) is "long" (more than 256 characters). The output files would not be quite complete.
This article applies to HII rev 9. Rev 9.1 (see this article) incorporates the new version.