I was at the ministry of finance today working on a project there, when one of the IT department employees came and told us to try and create a new folder and give it the name "con". I tried it, created a new folder on the desktop and named it "con" and I hit enter, and for my surprise, the folder name switched back to "New Folder". It turned out that you cannot name a folder "con" in windows. I googled about it and found out that "con" is a DOS reserved word. Read about it
here