I think you are getting it wrong. You can not interpret binary files as text files. What I mean is here:

fileEncoding.GetString(bufferBlock)

As I understood bufferBlock can contain contents of a binary file. Then you are calling a method which will try to interpret these bytes as some text encoded in some encoding. But this might not be the case, since the file was not a text file to begin with. More details here: http://stackoverflow.com/questions/10353913/streamreader-vs-binaryreader/

I think you are getting it wrong. You can not interpret binary files as text files. What I mean is here:

fileEncoding.GetString(bufferBlock)

As I understood bufferBlock can contain contents of a binary file. Then you are calling a method which will try to interpret these bytes as some text encoded in some encoding. But this might not be the case, since the file was not a text file to begin with. More details here: https://stackoverflow.com/questions/10353913/streamreader-vs-binaryreader/