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To add subkeys and values to the Windows registry, use REG add. The basic syntax for creating a key or value is

reg add KeyName /v ValueName /t DataType /d Data

where KeyName is the name of the key you want to examine, ValueName is the subkey or key value to create, DataType is the type of data, and Data is the actual value you are inserting. That seems like a lot of values, but it is fairly straightforward. Consider the following example:

reg add HKLM\SYSTEM\CurrentControlSet\Services\DNS /v DisplayName
/t REG_SZ /d “DNS Server”

Here, you add a key value called DisplayName to the DNS key in the registry. The key entry is a string with the “DNS Server” value. Note the double-quotation marks. The quotation marks are necessary in this example because the string contains a space.

When you set expandable string values (REG_EXPAND_SZ), you must use the caret (^) to escape the percent symbols (%) that designate the environment variable you use. Consider the following example:

reg add HKLM\SYSTEM\CurrentControlSet\Services\DNS /v ImagePath
/t REG_EXPAND_SZ /d ^%SystemRoot^%\System32\dns.exe

Here, you enter ^%SystemRoot^% so that the SystemRoot environment variable is properly entered and interpreted.

When you set non-string values, you don’t need to use quotation marks, as shown in this example:

reg add HKLM\SYSTEM\CurrentControlSet\Services\DNS /v ErrorControl
/t REG_DWORD /d 0x00000001