It's quite a common "exam" question to ask a variation of that, I think I had one which asked why the length of two files were different, one on linux, one on unix. The answer of course being that the windows file was using an extra for every line!
If you ever need to try and find out some info about a binary file then you can use the "strings" command and sometimes extract some useful information. I remember someone once releasing an application with a hard-coded password in it - we were able to use strings and pull it straight out of there!