The QuBit interpreter ..

QuBit.cs

using System;
using System.IO;
using System.Linq;

namespace qubit
{
    public class QuBitInterpreter {

        public static byte[] stack;
        public static int pointer;

        public static void Run(string code) {
            code = File.ReadAllText(code).Replace("\r", "").Replace("\n", "").Replace("\t", "");
            int unmatchedBracketCounter = 0;
            string[] blocks = Enumerable.Range(0, code.Length / 4).Select(i => code.Substring(i * 4, 4)).ToArray();
            for(int i = 0; i < blocks.Length; i++) {
                switch(blocks[i]) {
                    case "0000": // >
                        pointer++;
                        break;
                    case "1111": // <
                        pointer--;
                        break;
                    case "0110": // +
                        stack[pointer]++;
                        break;
                    case "1001": // -
                        stack[pointer]--;
                        break;
                    case "1100": // .
                        Console.Write(System.Convert.ToChar(stack[pointer]));
                        break;
                    case "0011": // ,
                        var key = Console.ReadKey();
                        stack[pointer] = (byte)key.KeyChar;
                        break;
                    case "1010": // [
                        if (stack[pointer] == 0) {
                            unmatchedBracketCounter++;
                            while (blocks[i] != "0101" || unmatchedBracketCounter != 0) {
                                i++;
                                if (blocks[i] == "1010") {
                                    unmatchedBracketCounter++;
                                } else if (blocks[i] == "0101") {
                                    unmatchedBracketCounter--;
                                }
                            }
                        }
                        break;
                    case "0101": // ]
                        if (stack[pointer] != 0) {
                            unmatchedBracketCounter++;
                            while (blocks[i] != "1010" || unmatchedBracketCounter != 0) {
                                i--;
                                if (blocks[i] == "0101") {
                                    unmatchedBracketCounter++;
                                } else if (blocks[i] == "1010") {
                                    unmatchedBracketCounter--;
                                }
                            }
                        }
                        break;
                }
            }

        }

        public static void Convert(string bf)
        {
            string code = File.ReadAllText(bf);
            File.WriteAllText(Path.GetFileNameWithoutExtension(bf) + ".qb",
                code.Replace(" ", "")
                .Replace(">", "0000")
                .Replace("<", "1111")
                .Replace("+", "0110")
                .Replace("-", "1001")
                .Replace(".", "1100")
                .Replace(",", "0011")
                .Replace("[", "1010")
                .Replace("]", "0101")
            );
        }

        public static void Main(string[] args) {
            stack = new byte[1000];
            if(File.Exists(args[0]) && Path.GetExtension(args[0]).ToLower() == ".qb") {
                Run(args[0]);
            } else if(File.Exists(args[0])) {
                Convert(args[0]);
            } else {
                Console.WriteLine($"{args} is not a file that i can find..");
            }
        }
    }
}

Sample.qb

000001100110011001100110011001100110011001101010111101100110011001100110011001100110011001100000100101011111100100000000000000000000011001100110101000000110011001100000011001100110111111111001010111111111111111110110111110100000101000000110
000001101111111110010101000000001010100111111111011000000000010101100110011001100000011011111010100111111001000001011111101010101001010100000000100111111111010100000000101010101001010111111111011000000000010111111111101010101001010100000000
000000000000000010101010100101011111011001100110011001100110011001100110011011111001000000000101111110011010000001100000011011111111100101010000101011110110000010010101011000001010101010010101111110010000010111111111111111111111111111111111
111110010000000001011111101000000110000001101111111110010101000000001010100111111111011000000000010101100000011011111010100111111001000001011111101010101001010100000000100111111111010100000000101010101001010111111111011000000000010111111111
111110100000000001100000011011111111111110010101000000000000101010011111111111110110000000000000010101100110000001101111101010011111100100000101111110101010100101010000000010011111111101010000000010101010100101011111111101100000000001011111
111110100000011011111010100101010101111110100000000001101111111110101001010101010000000010101111111101100000000010101001010101011111111111111010000000000110000001101111111111111001010100000000000010101001111111111111011000000000000001010110
011001100110000001101111101010011111100100000101111110101010100101010000000010011111111101010000000010101010100101011111111101100000000001011111111110100000011011111010100101010101111110100000000001101111111110101001010101010000000010101111
111101100000000010101001010101011111111110101010100101010000000000000110011001100110011001100110011010100000000001100110011001100110011011111111100101010000101011110110011001100110011001100110011010100000011001100110011001100110111110010101
000011001111011001100110011001100110011001101010000010011001100110011001100111111001010100001010111111110110000000001001010101010000110011111111011001100110011001100110011001101010000000001001100110011001100110011111111110010101111110101001
000000000110111111110101111101100110011001100110011001100110101011110110011001100110000010010101111111000000011001100110011001100110011010100000011001100110011001100110011001100110111110010101000001100110011011001111011001100110011001101010
000001100110011001100110011001100110011011111001010100001100011001100110011001101100110010011001100110011001100110011001110010011001100110011001100110011100011001100110011001100110011001100110011001100110011001100000000010100000000000000110
000001101111111111111111100101010000000000000000101010011111111111111111011000000000000000000101000001101111101010011111100100000101111110101010100101010000000010011111111101010000000010101010100101011111111101100000000001011111111111111111
101000000000000001100000011011111111111111111001010100000000000000001010100111111111111111110110000000000000000001010110000001101111101010011111100100000101111110101010100101010000000010011111111101010000000010101010100101011111111101100000
000001011111111111111010000000000110111111111010100101010101000010100000011011111010100101010101011001100000000001101111101010011111100100000101111110101010100101010000000010011111111101010000000010101010100101011111111101100000000001011111
011011111010101010010101000010011111010100001010111111111111111111111111111111000000000000000000000000000000101010010101010111111111111111111111111111111111111111000000000010011001100110011100100110011001100110011001100110011001110011111111
110000000000100110011001100111000110011001101100110001100110011001100110011001100110011001100110011001101100101010010101111111111010100101010101111110100000011000000110111111111001010100000000101010011111111101100000000001010110000001101111
101010011111100100000101111110101010100101010000000010011111111101010000000010101010100101011111111101100000000001011111111111111010000000000110000001101111111111111001010100000000000010101001111111111111011000000000000001010110011001100110
000001101111101010011111100100000101111110101010100101010000000010011111111101010000000010101010100101011111111101100000000001011111111110100000011011111010100101010101111110100000000001101111111110101001010101010000000010101111111101100000
000010101001010101011111111110101010100101010000011001100110011001100110011001101010111101100110011001100000100101011111110000000110011001100110011001100110011001100110101000000110011001100110011001100110011001100110011011111001010100000110
110010011100111111111100000000000110011001100110011001101100100110011001100110011001100110011001100110011001110010011001100111001111111111000000011001100110011001100110101000000110011001101111100101010000110011110110011001100110011001101010
000010011001100110011111100101010000011001101100011001100110011001100110011001100110011001101100110010101001010111111111101010010101011001100110011001100110011001100110011011001010100101010101111110100000011000000110111111111001010100000000
101010011111111101100000000001010110011001100000011011111010100111111001000001011111101010101001010100000000100111111111010100000000101010101001010111111111011000000000010111111111101010101001010101100110011001100110011001100110011001101100
000001100110011001100110011001100110011010100000011001100110011001100110011001100110111110010101000001100110011011000110011001100110011001100110011001100110011001100110110001100110011001100110011001100110011001101100100110011001100110011001
110011110110011001100110011001100110011010100000000001100110011001101111111110010101000000001100111101100110011001100110011001100110011001101100100111001001100110011001100110011001100110011100000011001111100111000110011001100110011001100110
011001100110011011000110011001100110011001100110011011001001100110011001100110011001100110011100000011001111100110011001100110011001100110011001100110011001100111000110011001100110011001100110011001100110011001100110110010011001100110011001
100110011001100110011100000011001111011001100110011001100110011001100110011001100110110010011001100110011001100110011001100110011001100110011001100111001111011001100110101000000110011001100110011001101111100101010000110011000000110011111001
100110011001100110011001100110011001110001100110011001100110011001100110011001100110110000001100111111110110011001101010000010011001100110011001100111111001010100001001110001100110011001100110011001100110011001100110011001100110011001100110
110010011001100111000110011001100110011001101100100110011001100110011001100111001001100110011001100110011001100110011001110010101001010100001010100101011111111111111100101010010101010111111010000001100000011011111111100101010000000010101001
111111110110000000000101011001100110011000000110111110101001111110010000010111111010101010010101000000001001111111110101000000001010101010010101111111110110000000000101111111111010101010010101011001100110011001100110011001100110011011001010
100101011111101010010101000001011111011011110101