Bcdboot - Bcd boot file creation and repair tool.
The bcdboot.exe command-line tool is used to copy critical boot files to the
system partition and to create a new system BCD store.
bcdboot [/l ] [/s ] [/v]
[/m [{OS Loader ID}]]
source Specifies the location of the windows system root.
/l Specifies an optional locale parameter to use when
initializing the BCD store. The default is US English.
/s Specifies an optional volume letter parameter to designate
the target system partition where boot environment files are
copied. The default is the system partition identified by
the firmware.
/v Enables verbose mode.
/m If an OS loader GUID is provided, this option merges the
given loader object with the system template to produce a
bootable entry. Otherwise, only global objects are merged.
Examples: bcdboot c:\windows /l en-us
bcdboot c:\windows /s h:
bcdboot c:\windows /m {d58d10c6-df53-11dc-878f-00064f4f4e08}