({
  "path" : "D:\Files",
  "files" : [
    {"name" : "..","type" : "$UP$" },
    {"name" : "Readme.text","type" : "$File$" }
  ]
});

Gson gson = new GsonBuilder()
            .setLenient() // Attempt to get around the bad JSON, but didn't really help
            .create();

    Retrofit retrofit = new Retrofit.Builder()
            .baseUrl(baseUrl)
            .addConverterFactory(GsonConverterFactory.create(gson))
            .addCallAdapterFactory(Java9CallAdapterFactory.create())
            .client(mHttpClient)
            .build();

public class JsonFixerInterceptor implements Interceptor {
        @Override
        public Response intercept(Chain chain) throws IOException {
            final Request request = chain.request();
            final Response response = chain.proceed(request);

            // Removing the leading garbage character is easy
            response.body().byteStream().skip(1);

            return response;
        }
    }

OkHttpClient.Builder builder = new OkHttpClient.Builder()
        .addInterceptor(new HttpLoggingInterceptor().setLevel(HttpLoggingInterceptor.Level.BODY))
        .addInterceptor(new JsonFixerInterceptor());

    mHttpClient = builder.build();