Originally Posted by Drumstix42
You should be able to use the old icons plus the old /images/icons/icon_trans2.dds file to get the square icons back no problem.
And considering you're not claiming the files to be yours, and people have used old skin files in the past, I don't see the problem.
The square icons seem to be in the icon_transp1.dds file. I was desperate to lose the rounded corners and retrieving that file seemed to do the job for both my hotbars and bags.
Thanks for pointing me in the right direction