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Before editing any registry entries, you must save the parent subkey using the reg save command. If the edit fails, you can then restore the original subkey using the reg restore operation.
The return values for the reg save operation are:
Value
Description
0
Success
1
Failure
Examples
To save the hive MyApp into the current folder as a file named AppBkUp.hiv, type:
reg save HKLM\Software\MyCo\MyApp AppBkUp.hiv
reg unload
Removes a section of the registry that was loaded using the reg load operation.
Syntax
reg unload <keyname>
Parameters
Parameter
Description
<keyname>
Specifies the full path of the subkey. To specify a remote computer, include the computer name (in the format \\<computername>\) as part of the keyname. Omitting \\<computername>\ causes the operation to default to 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 a remote computer is specified, valid root keys are: HKLM and HKU. If the registry key name contains a space, enclose the key name in quotes.
/?
Displays help at the command prompt.
<keyname>
\\<computername>\
\\<computername>\
Remarks
The return values for the reg unload operation are:
Value
Description
0
Success
1
Failure
Examples
To unload the hive TempHive in the file HKLM, type:
reg unload HKLM\TempHive
Caution
Don't edit the registry directly unless you have no alternative. The registry editor bypasses standard safeguards, allowing settings that can degrade performance, damage your system, or even require you to reinstall Windows. You can safely alter most registry settings by using the programs in Control Panel or Microsoft Management Console (MMC). If you must edit the registry directly, back it up first.
reg commands
Performs operations on registry subkey information and values in registry entries.
Some operations enable you to view or configure registry entries on local or remote computers, while others allow you to configure only local computers. Using reg to configure the registry of remote computers limits the parameters that you can use in some operations. Check the syntax and parameters for each operation to verify that they can be used on remote computers.
Caution
Don't edit the registry directly unless you have no alternative. The registry editor bypasses standard safeguards, allowing settings that can degrade performance, damage your system, or even require you to reinstall Windows. You can safely alter most registry settings by using the programs in Control Panel or Microsoft Management Console (MMC). If you must edit the registry directly, back it up first.
Syntax
reg add
reg compare
reg copy
reg delete
reg export
reg import
reg load
reg query
reg restore
reg save
reg unload
Parameters
Parameter
Description
reg add
Adds a new subkey or entry to the registry.
reg compare
Compares specified registry subkeys or entries.