Because of their usefulness and ubiquity, EXE files are commonly used as a method of delivery for virus / malware infection. Often, viruses will be disguised as a benign EXE file (such as n360-tw-20-1-0-24-en-us.exe) and distributed through SPAM email or malicious websites, which can then infect your computer when executed (eg. when you double-click the EXE file).