CmdID

CmdID / Commands / reg

reg export

Copies the specified subkeys, entries, and values of the local computer into a file for transfer to other servers. Windows commands reference

On Windows

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Windows

from the Windows commands reference, CC BY 4.0
reg export <keyname> <filename> [/y]
reg export HKLM\Software\MyCo\MyApp AppBkUp.reg
<keyname>Specifies the full path of the subkey. The export operation only works with the local computer. The keyname must include a valid root key. Valid root keys for the local computer are: HKLM, HKCU, HKCR, HKU, and HKCC. If the registry key name contains a space, enclose the key name in quotes.
<filename>Specifies the name and path of the file to be created during the operation. The file must have a .reg extension.
/yOverwrites any existing file with the name filename without prompting for confirmation.
/?Displays help at the command prompt.