Very recently a Elder Scrolls fan with some programming skills released a working tool for editing Arena files. While still in-progress, it still does what no other tool (for Arena) does, allowing easy import and export of image files. Even better, because Arena uses a very old school format, his program converts the images to BMP when exporting and reconverts them when importing back in. Now I started making a graphic mod for Arena a year ago, doing it the hard way. I had to edit the images in raw form. I got about 25 of the files done (around 2-5 pictures in each set) but then got tired of all the manual labor involved. This program makes everything much simpler and I have already dusted off the old files, fixed a few, and completed a couple more.
Here’s the link to the program…Arena Modder .95