MLCad doesn't appear to ignore the transformation for me.
If I build a model now with a u9131.dat and 132-old.dat then I have to rotate 132-old.dat to get them to match, but presumably since there is a transformation in the current 132-old.dat then if I had built the model 5 years ago I wouldn't have needed that same rotation - all tyres would be 1 0 0 0 1 0 0 0 1 with the side of my "car" in MLCad's "front" view - as you get now with u9131.dat.
But if MLCad loads an old model now with the old part at 1 0 0 0 1 0 0 0 1 it then detects the new part (which is internally oriented differently from the old part) and if I allow it to "upgrade" the part it does apply the transformation from 132-old.dat which causes it to negate the internal rotation that took place when the part was originally changed.
Apologies if I've totally missed the point - this is more than a little confusing without access to how 132-old.dat presumably used to look before 2011 and with a model built back then. But answering "yes" or "no" to the "upgrade?" prompt does provide different results - so transformation is not being ignored (I didn't test with origin offset).
If I build a model now with a u9131.dat and 132-old.dat then I have to rotate 132-old.dat to get them to match, but presumably since there is a transformation in the current 132-old.dat then if I had built the model 5 years ago I wouldn't have needed that same rotation - all tyres would be 1 0 0 0 1 0 0 0 1 with the side of my "car" in MLCad's "front" view - as you get now with u9131.dat.
But if MLCad loads an old model now with the old part at 1 0 0 0 1 0 0 0 1 it then detects the new part (which is internally oriented differently from the old part) and if I allow it to "upgrade" the part it does apply the transformation from 132-old.dat which causes it to negate the internal rotation that took place when the part was originally changed.
Apologies if I've totally missed the point - this is more than a little confusing without access to how 132-old.dat presumably used to look before 2011 and with a model built back then. But answering "yes" or "no" to the "upgrade?" prompt does provide different results - so transformation is not being ignored (I didn't test with origin offset).