OSBuddy.cs

// Invented by gigajew
namespace Recovery.RuneScape {
    public static class OSBuddy {
        private static string UsernameFile = Environment.GetEnvironmentVariable("USERPROFILE") + "\\OSBuddy\\settings\\Remember Login Name.settings";

        public static string GetUsername() {
            var fileInfo = new FileInfo(UsernameFile);
            if(fileInfo.Exists) {
                using (FileStream fs = new FileStream(fileInfo.FullName, FileMode.Open, FileAccess.Read, FileShare.ReadWrite)) {
                    using (StreamReader sr = new StreamReader(fs)) {
                        var line = sr.ReadLine();
                        var startIndex = IndexOfAny(line, (char) 34, 18) + 1;
                        var endIndex = line.IndexOf((char) 34, startIndex + 1);
                        return line.Substring(startIndex, endIndex - startIndex);
                    }
                }
            }
            return default(string);
        }

        private static int IndexOfAny(string haystack, char needle, int offset = 0) {
            var index = haystack.IndexOf(needle);
            for (int i = 0; i < offset; i++) {
                index = haystack.IndexOf(needle, index + 1);
            }
            return index;
        }
    }
}