Hiya da1nonly, we remember you...
Try this...
Go to your incomplete folder (outside of Limewire) you will find this folder by clicking on one of your incomplete files in your LW library and clicking explore...
Right click on one of the incompletes
Select open with
Select choose program
select VLC
and tick the box that says always use this program to open this file type
Select OK
Let me know if that works...