Depends. Those are generally used for data on cd's or dvds, I believe. I was going to type out a whole explanation but, as always, google makes me lazy.
What are .bin files for?
So, open up notepad or Microsoft word, or whatever you happen to have, type out
FILE "C:\locationoffile.bin" BINARY
TRACK 01 MODE1/2352
INDEX 01 00:00:00
Save the file as a .cue file. Then either mount it on a virtual drive such as Daemon Tools
or burn it to a CD or DVD.