sdk-for-dart VS sdk-for-flutter

I believe Appwrite supports oauth on windows, they added it 6 months ago. I'm sure you could look at how they did it https://github.com/appwrite/sdk-for-flutter/issues/8

Once you add this dependency and run flutter pub get to get the updated dependencies, you should be able to use it in your Application. Note that this is a huge breaking change, as every call to Appwrite SDK to any service previously returned a Response object with data as JSON object received from server. However with this release, every endpoint will return a proper response objects instead. For example account.create() will return a User object where as account.createSession() will return a Session object. All other services will return similar objects in response. If there is an error during API call that you don't receive the expected message from server, SDK will throw an AppwriteException as before. You can view the details on how each service/method returns by going to our GitHub repository.