The FileReader ignores the first two bytes. What's the matter?

Question

Java

I have the simplest code to test the operation of FileReader:

Code/Java

Reader r = new FileReader("1234.dmap");
System.out.println(Integer.toHexString(r.read()));
System.out.println(Integer.toHexString(r.read()));
System.out.println(Integer.toHexString(r.read()));
System.out.println(Integer.toHexString(r.read()));

Actually, the file itself:

1234.dmap

EB AF 3D 1A 63 6F 6D 2E

And the console output after executing the code:

Conclusion

fffd
3d
1a
63

As you can see, FileReader completely ignores the first two bytes, in addition, the size of the first byte is oversized. At the same time, everything works fine with FileInputStream
Help me figure out the problem

Answer 1

FileReader is not designed to read "raw" data, it reads text data taking into account the system encoding.
https://javarush.ru/help/7579