Disappearing LEX File...virus??

[EasyObserver]

Hi...my second post since becoming a member an hour ago. I have been having a problem with one of my External HD's and just remembered that on that particular HD, occasionally I will go into a directory and see a file named LEX_2009761 (numbers change but always LEX_). When I try to open, copy, delete or anything on it, it disappears, at which point I can go to another directory on the external and find it sitting in there with a different number, but same thing, if I try to delete or copy (basically, 1 second after I right-click on it) it disappears..only to reappear in yet another directory. Does anyone know if this is some kind of virus..or a legit file? At first I thought it might have something to do with my Lexmark printer..but it doesn't seem right to me.

Any help would be greatly appreciated.

Thanks in advance.

[res]

did you ever figure out what these files were (lex_ radom set of numbers) i am stuck on what they are

[Jelly Bean]

Gosh I am not sure of this:

 

Possibilites:

 

 

http://en.wikipedia.org/wiki/Lex_(software)

 

http://publib.boulder.ibm.com/infocenter/zvm/v5r4/index.jsp?topic=/com.ibm.zvm.v54.dmsp4/hcsp4b1035.htm

 

LEX error - Google Search=

 

I would wait and see if others can input.