I didn't felled like studying for some hours, so I thought: "A heck, I'll just go and make my first SDK tool".
It's all a bit blend now, since I'm the only one that has to understand it for now.
Anyway, it is used to fixed format errors in the ASE versions of the map files (which can be ported to T3D, which can be imported by UT3). It also adds support for textures in ASEtoT3D.
Next day, I was still bored, so I finished it. It's fully working and ofcourse user-friendly (as in, people can't mess up what it's doing :P).
It's quite fast for small files, but when a file is around 25 MB, fixing the MESH_NORMALS can take up quite some time (around 67 minutes at full speed), there is no workaround for this, since this fix is VERY important.
At the time of writing this, the tool already entered version 1.1 status, because there was one small bug.