This is quite a neat little program, davwms. Lots of potential here. Thanks for designing it and letting us download it.
I have a couple questions, though.
First off, is there a limit to the number of lines you can have in each dat file? I tried pasting in an extra few hundred entries and it gave me a runtime error when i tried opening it up again.
Also, will it accept duplicate entries? Having more than one of the same entry seems to be causing it to crash on startup as well.