Which command repairs the bootmgr file in Windows?

The command that specifically repairs the bootmgr file in Windows is bootrec /fixboot. This command is part of the Bootrec tool, which can help troubleshoot and fix problems related to the Windows boot process, including issues with the Master Boot Record (MBR) and the Boot Configuration Data (BCD).

When you run bootrec /fixboot, it writes a new boot sector to the system partition, which can help resolve issues where the boot manager may be corrupted or missing. This is particularly important when faced with the "missing bootmgr" or similar errors during startup.

The other commands serve different purposes: msconfig is used for configuring system startup options, bootrec /rebuildbcd is used to scan for installed operating systems and create a new BCD if necessary, and the path 'boot\bcd' is not a command but a reference to the BCD file itself. Each has its role in troubleshooting, but for specifically repairing the bootmgr, bootrec /fixboot is the most appropriate command.