I inserted my USB in a friend's laptop and I noticed that they all turned into .exe files. I figured it was only because my friend's laptop was very slow and I think it is infected. But when I inserted the USB back to my laptop, the folders remained as .exe. My laptop is probably clean (undergoing a Redirect malware cleaning as of the moment) but I haven't encountered any problems like this before. I can't format my USB because I need the files. Please help.