winamp doesn't always enqueue files on double-click in windows explorer :(
 

When I double click a file in windows explorer, winamp SOMETIMES wipes off my playlist and starts playing the file, and SOMETIMES adds the file to the bottom of the list.
although I expect it to always put it at the bottom of the list, as I've checked the "enqueue files on double-click in windows explorer"

I've tried reinstalling the latest version of winamp, to no avail.

help!