What are these mysterious documents on my hard drive?

I was out of town for the last 3 weeks, so no one was using my home computer, but I left it on anyway. I normally never turn it off, unless I'm rebooting it or moving it. Upon returning home, I woke it up and opened the Finder window, I found 3 mysterious 4kb documents on my hard drive. These were not in my Home folder, but were sitting above the Applications folder in Finder. They weren't there before I left town. All three of them were dated differently. One a month for Sept., Oct., and Nov. Very odd. When I try to open them, I get a message saying, " The document "" could not be opened. You don't have permission. To view or change permissions, select the item in the Finder and choose File>Get Info." So I did this and I got no useful information. I ran a Disk Permission - Repair Permissions and still could not open these documents. I decided to delete them.
Then today, I find there's another one, with the time stated as being Today, 1:36 AM. The others also had early morning hours attached to them too. So it appears to be the exact same sort of thing. What the heck are these documents and why are they suddenly appearing on a monthly basis?

John,
Thanks for telling me how to do the screen shot thing, I never knew.
You can see in the Finder window the first thing is the unknown document that showed up yesterday.
Next is the Get Info window you asked for, which says I can open it using TextEdit, but it's locked.
When I try to open it using TextEdit by clicking on the Open with TextEdit.app, which is the only option, I got this:
Clicked the Continue button and got this message:
So next I clicked on Update and got this message:
Clicking on the OK button closed the message windows but the Info window remained opened.
As I said in my original post, I've been getting these unkown documents once a month since September 2012. I had never seen them before this week though.
What do you think they are, should I be concerned about them or just delete them and not worry?

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Now leave the keyboard and mouse alone, as many things you might do will cause the drives to be accessed. You probably want to find what does it when you’re not actively interacting with the computer. It’s not really necessary to wait for your drives to sleep and see what wakes them. Any activity you see would probably wake the drives if they were asleep. When you see some activity and want to stop and examine, type Control-C to stop the output. On the far right of each entry is the process or application that accessed the disks.
I got pointers from http://system-log.tyr.org.uk/2012/01/31/how-to-stop-usb-drives-from-spinning-up- unnecessarily-on-os-x-lion/ and http://www.jackenhack.com/disk-that-refuses-to-sleep-in-mac-os-x-how-to-fix-it/

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