As for the WEM files in Starfield, seems like it does not make sense to process them.
xtool:dd3:l4
Code:
Compressed 125,234 files, 1,993,236,804 => 1,878,585,133 bytes. Ratio 94.25%
Compression time: cpu 6.13 sec/real 44.43 sec = 14%. Speed 44.87 mB/s
All OK
Compressed 1 file, 1,870,743,269 => 1,839,107,129 bytes. Ratio 98.31%
Compression time: cpu 0.52 sec/real 63.26 sec = 1%. Speed 29.57 mB/s
All OK