o2 xda mini - can't delete file off SD card

Just a little quirk I noticed. I copied a aaa.avi file onto SD card. Used Betaplayer to play it. When I tried to delete aaa.avi from SD card, kept complaining that another program was holding it and therefore cannot be deleted. This is impossible because I actually took SD card out of the mini and used a external USB card read to delete/copy!

Had a look at Properties of the aaa.avi file. Found that it was set to "Archive"..unchecked...now able to delete!

Most probably Betaplayer's the culprit..will confirm! :)