A long-term bug between first ZC and stretching all the way to New ZC(Drop Down Menu)

Can't believe no one noticed this bug and it occurs in every version of ZC. You now how you want to import or grab from some type of file and so the dialog box for that pops up. You know how in MS Paint when you want to open you have the box below the name box to show what file types you want? (All Picture Files=Default) If you click the arrow you can change the association? When you do it, the previous file associations no longer appear making scrolling easier? Its doesn't woork in Zquest. Screenshots:

Here (its in 2.10, but in all the versions below and up) you see the screen for grabbing from a tile.



When you go in and take and click on the down menu and click to a different file association, none of the files dissapear that isn't part of the association:



And as that screen shows, I wanted the files associated with .bmp.