Originally Posted by simplicissimus
The extension '.bin' only means that it is a binary file, as such it can be anything from Microsoft Excel to an executable application - in short anything that is not explicitly ASCII text.
echo "Howdy" > hithere.bin
hithere.bin: ASCII text
On UNIX-like systems the "extension" in general has nothing to do with file type. But you can always run the file
command from a terminal to determine what kind of file it is.