FWIW: It's probably wise to enable yourself to see file extensions.
Looking at a file without the extension provides no clue whatever to what that file might be...and the names used before the file extension...can be used any number of times, by any type of file.
A file may be malware or simply a different type of file...without looking at the extension, a user has no clue. Some malware files will employ legitimate file names but the giveaway occurs when a user sees two file extensions, rather than one.
See first item at http://www.malwarehelp.org/malware-prevent...le%20extensions