I used to have a different program for it, now I don't remember what it was. Currently using L2UTX Viewer, but for some .utx files I seem to get errors, for most I dont.

Error is:


Anyone know how to resolve this, or suggest a different application.

Cheers

Simply use UModel to batch export textures (it has an option to either export everything as .tga, or export compressed textures to .dds)
alternatively, you can use l2tool, etc