I don't know about Wirsbo Joistrak, but I've cut aluminum
1. You need a sharp metal blade
2. It might get hot while being cut
Ideally you would use a metal band saw since you want a slow blade speed and lots of teeth per inch. My wood band saw has a metal blade and does cut AL, but it's slow and the AL get's warm.
I've heard of people using fine saw blades in table saws, but I would not recommend that route.
In a pinch... I've used my chop saw and the abrasive blade to cut AL, but the AL will get really hot and the cut is not very clean.