Utilities.jar are for migration etc.. purposes.
You've got 4 buttons:
1- add ( to add new documents no presents in openkm )
2- edit ( when you edit some document add and edit documents are disabled ) then you've got enabled checkin or cancel checkin ( that's upload new version )
3- checkin to upload new version
4- cancel checkin
if you close document while are editing ( check-out from openkm ) and other day open , addin might detect in and disables add and edit button and only enable checin and cancel.
http://wiki.openkm.com/index.php/Word_Addin
hope it helps you