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When the winrm communicator executes a command in an elevated shell, this patch causes it to escape double quotes. This is necessary as the first line in the file that it produces and then executes it puts the command into a variable called command that is delimited by double quotes.
Vagrant Core Plugins
These are plugins that ship with Vagrant. Vagrant core uses its own plugin system to power a lot of the core pieces that ship with Vagrant. Each plugin will have its own README which explains its specific role.