What are these syslog errors?

I got these syslog errors when either Windows Media Player or Windows Media Center (Windows 7) was running and doing something with my music library. I'm thinking it was while WMP was running but I notice both WMP and WMC will perform a bunch of disk operations on my music library disk every time I run either.

Mar 1 23:40:14 MediaServer shfs: shfs_setxattr: setxattr: /mnt/disk2/Music/Van Halen/Balance/~8 - Aftershock.tmp (95) Operation not supported

Mar 1 23:40:16 MediaServer shfs: shfs_setxattr: setxattr: /mnt/disk2/Music/Van Halen/Balance/~1 - Take Me Back (Deja Vu).tmp (95) Operation not supported

Mar 1 23:40:18 MediaServer shfs: shfs_setxattr: setxattr: /mnt/disk2/Music/Van Halen/Balance/~2 - Feelin'.tmp (95) Operation not supported

Mar 1 23:40:20 MediaServer shfs: shfs_setxattr: setxattr: /mnt/disk2/Music/Van Halen/Balance/~4 - Amsterdam.tmp (95) Operation not supported

Mar 1 23:40:22 MediaServer shfs: shfs_setxattr: setxattr: /mnt/disk2/Music/Van Halen/Balance/~5 - Big Fat Money.tmp (95) Operation not supported

Mar 1 23:40:22 MediaServer shfs: shfs_setxattr: setxattr: /mnt/disk2/Music/Van Halen/Balance/~9 - Doin' Time.tmp (95) Operation not supported

Mar 1 23:40:23 MediaServer shfs: shfs_setxattr: setxattr: /mnt/disk2/Music/Van Halen/Balance/~6 - Strung Out.tmp (95) Operation not supported

Mar 1 23:40:25 MediaServer shfs: shfs_setxattr: setxattr: /mnt/disk2/Music/Van Halen/Balance/~2 - Can't Stop Lovin' You.tmp (95) Operation not supported

The odd thing is there is no files with a .tmp extension in my music library. For example, the top file that exists is called "08 - Aftershock.mp3".

Any ideas what is causing this and why it only happened for that group of songs?

Peter