well this particular 'bug' is more of a visual one
the item is selected, its just not the active selection. this can be reproduced with a mouse by opening 2 windows, selecting something in 1 window, then clicking the other window..
the item in the origional window is still selected, its just not active and selected... (in windows XP i believe; it used to be a dotted line around the file, but in windows 7, its just a less-visible version of fully selected.
If your looking to change it, its likely part of the theme file... but it wont be easy...