Which "main" menu? The WindowBlinds Configuration menu?
There have been no changes to the Win2K code since version 4.3, even though the "current" version is shown in SDC as 4.59[b].002 - if you check the About WindowBlinds dialog on a Win2K rig, you'll see it is still at 4.3 (build 120-NXP).
There "shouldn't" have been any changes going from 4.51 to 4.59, since they are the same codeset on Win2k, and I certainly haven't seen any changes on my Win2K rigs.
Cheers,
Daiwa