Yea you were right about the *.lz files. The *.RLE's are raw image files. The format is as follows it seems:
0x0 - Width of bitmap
0x4- Height of bitmap
0x8- Some sort of value
0xC- Data Start
I just don't know the encoding this image format uses. I'm not very good at images (In fact, I'm terrible at them). Luckily, developers were generous enough to leave their *.TM2 unconverted, where the raw data lines up. So, the raw images may need to be rebuilt into the *.TM2 format? Some TM2's were left by the developers and some weren't, so some images are in just raw formats instead of those TM2 files.