Registry Backup and Restore via CLI batch

Hi, I want to take backup of a particular registry value and also need to restore the same with its default permissions(original permission). But all these I need to do with command prompt as I have created a batch file to modify registry. Can some one suggest how to export the particular registry value with permission in .reg file. I tried a command to export the value e.g. REG EXPORT HKLM\Software\agent d:\agent.reg this is working fine but when I tried on some other values like (the value name having space in between "New Key Test") REG EXPORT HKLM\Software\New Key Test d:\agent.reg It gives me an error Error: Too many command-line parameters Nothing exported. Please help me Thanks

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