This tool used to use dmg2img to perform the extraction of files from Apple's WindowsSupport.dmg file, but more recent versions of 7-Zip have included more completely support for DMGs, so dmg2img seems to be no longer needed. On Windows, the archives are unpacked using 7-Zip, and the 7-Zip MSI is downloaded and installed, and removed later if Brigadier installed it.
It unpacks the multiple layers of archives within the flat package and if the script is run on Windows with the -install option, it also runs the 64-bit MSI installer. A Windows- and OS X-compatible Python script that fetches, from Apple's or your software update server, the Boot Camp ESD ('Electronic Software Distribution') for a specific model of Mac.
