How to use plugins in your app

To use an existing plugin in your app, follow these steps:

  1. Place the plugin’s DLL file(s) inside your app’s directory (and inside your app’s opk file when you deploy it)
  2. Make sure the DLL is “Unblocked” – When you download a DLL file from a browser, Windows marks it as unsafe. Please make sure to check the “Unblock” box in the DLL’s file properties.
  3. Declare the plugin inside your manifest.json under data.extra-objects property.
    Here’s an example:
    “data”: {
      “extra-objects”: {
        “simple-io-plugin”: {
          “file”: “files/plugins/simple-io-plugin.dll”,
          “class”: “overwolf.plugins.SimpleIOPlugin”

    This tells Overwolf that your app contains a plugin named: simple-io-plugin that resides inside the file: files/plugins/simple-io-plugin.dll whose .NET class name is: overwolf.plugins.SimpleIOPlugin

  4. Inside your app’s Javascript code, create an instance of the plugin:
    var _plugin = null;
    overwolf.extensions.current.getExtraObject(“simple-io-plugin”, (result) => {
      if (result.status === “success”) {
        _plugin = result.object;

    Now you can call on the plugin’s functions/events/properties directly.   Take a look at our sample app on GitHub for an example of using a plugin. The sample app uses a generic helper class for initializing the plugin – feel free to use it or modify it in your own app.