What is .rar? and why does it spawn a .exe file on my computer?

I download things often, and have recently gone through some old discs that were burned by a pc, and downloaded them onto my new macbook pro.
Just curious what this 34544.rar thing is and why it expands, but doesnt' open.
In laymens terms, could someone fill me in?
It looks complicated. When I clicked on it, it made 2 new files there in my folder. dddd.1.exe, followed by ddd.exe-
Id like to know what that is.
Thanks for your time as well.
-an

A .rar file is a form of archive developed by Eugene Roshal, and called Roshal ARchive format (RAR.)
The contents of the archive you have is obviously a .exe file which is a DOS or Windows executable binary (hence, exe.) They do not run on Macs.
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Message was edited by: seaseasea added screenshot
Message was edited by: seaseasea
added device and osx

i couldnt say. it was just that i happen to be only upping, to dropbox, and then saw downloading on the monitor.
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