MKKE .xxx files

[xenon90]

I'm using 1.2.6.0 and replaced the .dll...Here's what I get when I try to .xxx renamed to .u (might be a good idea to add support for this xxx extension?) and switched to console

"Thrown by:InitializePackage
  at UEExplorer.UI.Tabs.UC_PackageExplorer.InitializePackage()
  at UEExplorer.UI.Tabs.UC_PackageExplorer.LoadPackage()
  at UEExplorer.UI.ProgramForm.LoadFile(String fileName)

Could not load type 'UELib.Core.ObjectEventArgs' from assembly 'Eliot.UELib, Version=1.2.6.0, Culture=neutral, PublicKeyToken=null'."

Even my A:CM mods are throwing out the same error now