[Dx4win] How to remove confirmed flags???

[Karl Oyster, K1KO]

I'm in the process of trying to take my current DXLOG and after 
making a couple of spare copies, remove the confirmed flags (card 
in hand AND LOTW), but I can't figure out how to do it.  I have 
sneaking feeling that it may not even be possible as one would be 
unlikely to want to do anything like that and that it could be 
catastropic (or as catastrophic as anything in a hobby can be, 
anyway) if it happened accidentally.

Anybody have any idea how (or if) this can be done??

thanks and 73,

Karl, K1KO