Firefox.45.0.2.Ar.x64 
About Compressed Archive Files
An
 executable file is a file in a format that a computer can directly 
execute. Although most executable files are safe, these formats are the 
most commonly used to transmit viruses and infect computers with 
malware. Executable files should be scanned with up to date anti-virus 
software and should not be opened unless you trust the source or were 
expecting this file.
