Is this a virus? a .LCK file?

Well, a very strange file appear on my server. Its filename like: xxx.php.LCK. I download and open in notepad, the content was my computer name and my email address. I dont think I put this file up to my server and I am the only one who can login to my server. Isnt it obvious? My website being attacked by hacker? Is the .LCK a virus? Can I just delete it away?