WMI Registry Tools for JScript

Warning: this script provides functions that can modify the registry. As with any registry modification, the machine can be rendered non-functional by an improper edit. USE AT YOUR OWN RISK! I am not responsible for destroyed registries and unbootable computers!

Description: This JScript library** provides several functions that allow scripts to interface with the WMI Registry provider on local or remote machines. The library is intended to be run on/against Windows machines through the Windows Scripting Host. This reduces redundant code and makes the WMI registry functions as simple to use as the WSH registry functions.

Computer and Hive Arguments

All functions require computer and hive arguments. Computer should be a string containing an IP address or computer host name of the computer you wish to operate upon. If you are working with the local machine, use “.” for the computer argument. Hive is a string that determines which root hive you wish to connect to. The options are listed below (ie if you wish to retrieve a key under HKEY_CURRENT_USER, you would pass HKCU to the function).

hive argument




  • registryToolsEnumValues(computer, hive, key)

    • This function gets a list of all the values under a given key in the registry and returns an array of values and associated data types.
    • Takes three inputs:
      • computer – see above
      • hive – see above
      • key – a string containing the name of the key you wish to enumerate (list the values of)
    • Returns an object containing two arrays:
      • values – an array containing the string names of each value
      • types – an array containing a string denoting the data type of each value (REG_SZ, REG_BINARY, REG_DWORD, REG_EXPAND_SZ, REG_MULTI_SZ)
      • these arrays are related by index (ie values[0] types[0])
  • registryToolsReadValue(computer, hive, key, value, type)

    • Reads the data in a given value in the registry
    • Takes five inputs:
      • computer, hive – see above
      • key – a string containing the name of the key containing the value you want to read
      • value – the name of the value who’s data you want to read
      • type – the data type of the value (can be found using registryToolsReadValue or looking in the registry). Should be one of the following strings: REG_SZ, REG_BINARY, REG_DWORD, REG_EXPAND_SZ, REG_MULTI_SZ
    • Returns the data contained in the value. Data type depends on the type of the requested value, according to the following table: type returns


REG_SZ string

  • registryToolsWriteValue(computer, hive, key, value, type, data)

    • Writes the given data to the given registry key/value
    • Takes six inputs:
      • computer, hive – see above
      • key – the key containing the value you want to write to
      • value – the name of the value who’s data you wish to set
      • type – the type of data you wish to write: type input data type

REG_BINARY array of ints REG_DWORD hex or decimal number (int) REG_EXPAND_SZ string REG_MULTI_SZ array of strings

REG_SZ string

    *   *data* – this argument should contain the data you wish written into the value, in the type specified
*   Outputs: 
    *   none (currently, later revisions may return an error code if applicable)
  • registryToolsDeleteValue(computer, hive, key, value)

    • Removes the specified value from the given registry key
    • Inputs:
      • computer, hive – see above
      • key – string containing the key containing the value you wish to delete
      • value – string containing the name of the value to be deleted
    • Outputs:
      • none currently
  • registryToolsEnumKeys(computer, hive, key)

    • Lists the sub-keys of the given key
    • Inputs:
      • computer, hive – see above
      • key – string containing the name of the key to be enumerated
    • Outputs:
      • an array of strings containing the names of the sub-keys
  • registryToolsCreateKey(computer, hive, key)

    • Creates a new key
    • Inputs:
      • computer, hive – see above
      • key – the name of the key to be created (you can use “key//subkey//subkey2″ to nest keys)
    • Outputs:
      • none for now
  • registryToolsDeleteKey(computer, hive, key)

    • Removes given key (and all sub-values) from registry, but only if there are no sub-keys
    • Inputs:
      • computer, hive – see above
      • key – the name of the key to be removed
    • Outputs:
      • none currently

Note on “JS Library”: Since WSH and JScript do not normally support the inclusion of external code into a script, a handy workaround is found various places on the internet. I don’t take credit for this code!

In the script that you wish to make calls from, you must have two things: the include function (only needed once), and an eval call (which you use for each external file you wish to include). You can place the include() function anywhere in your script, but be sure that your eval statement occurs before the first time that you try to call an external function.

The Include() Function
function include(fileName) {
var fso = new ActiveXObject(“Scripting.FileSystemObject”); // create the file system object
if( !fso.FileExists(fileName) ) { return -1; } // check for file existance and fail if no file
var file = fso.OpenTextFile(fileName);
var stream = file.ReadAll();
return stream;

The Eval() Call
eval( include(“wmiRegistryTools.js”) );


I referred to the following pages while writing this script. There are probably even more pages that I found useful but who’s links I have forgotten.