[AccessD] Very Strange File Names - Temporarily

I recently opened up a folder that I use a lot. 

The screen showed about 20 files in this folder (mostly Access 2007
"accdb" files).

Three files had names like 449X228.

I have never seen this before.  I did a Print Screen to capture what I
was seeing.

I then went into Paint and pasted in the Print Screen.  The strange
thing is that when I did the paste in Paint, the real file names were
all shown correctly.

Has anyone else ever seen anything like this?

Poltergeist?

New feature?

Angry server gods?

Brad