I didn't felled like studying for some hours, so I thought: "A heck, I'll just go and make my first SDK tool".
Here's a screenshot:

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.
More on this later when it's out of pre-alpha.