It just means you aren't opening it correctly. Notepad is only made for plain text. To help you we would have to know what type of file, and/or where you found this file.
it's in a different format. maybe try opening in a hex editor or something? also try notepad++
What game? What file?
I believe that is an iOS executable. I believe you can use IDA to look at the assembly. You will probably need to know a tad of ARM assembly to be able to anything with it.http://www.mediafire.com/download/p73vp38b9i8gt08/FunRun
this is the file I'm trying to open
It doesnt have extensions