So can we use that to send binaries to people? Because gmail will absolutely not allow you do that. They will go as far as inspecting archives to look for binaries and ban you from sending them.
You can get around this by renaming the file to have some arbitrary image extension. Not ideal, but works.
I had to send some DLLs once -- that was a pain. I think the only thing that ended up working was zipping them and stripping the .zip extension off the file.