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press Start–>Run and enter the the following command in the open line
reg export "tree" file namewhere the “tree” is the registry tree you need to export (tree should be embraced with quotes);
For example, you need to export the
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control tree into the C:\result.reg fileThe command will be as follows
reg export "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control" c:\result.reg