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Bootcfg is a utility command used in the Recovery Console on Microsoft NT-based operating systems such as Windows NT, 2000, XP and Server 2003 installations. It is used to rebuild or add parameters to the existing Boot.ini file, which contains the OS choices during startup in the case of a multi-boot system environment where the user may choose which OS to boot every time the computer starts.
The Bootcfg command is used in the Recovery Console or command prompt of a compatible Windows OS and is used to either create or edit the boot.ini file that is used for selecting which OS to boot into as well as various other functions. Bootcfg as a command in Recovery console has different functions from bootcfg.exe's commands available when run on the command prompt. Bootcfg is simply another tool for editing boot.ini specifically, since boot.ini can still be edited using text editors like Notepad if the permissions of the file have been changed. It can also be edited using MSCONFIG. Bootcfg has been replaced by BCDEdit in Windows Vista and later versions.