What are .event files?

While running some backups over the weekend I noticed that every subfolder in my music directory had gained a file called xxxx.event (where xxxx was the name of the folder it was in). Since I have iTunes, there are a lot of subfolders so there were a lot of these .event files.

All of the files were zero-length and all were created over a three minute period about a month ago.

Does anyone know what these .event files are? Is it something new iTunes has suddenly decided it needs? I haven’t been able to find anything useful on-line and googling for “itunes .event” doesn’t seem to give me anything relevant.

This is on a Windows Vista system.

Anyone know what these are?