thanks andi
yes, richard is right, it works with autocad.
it looks expensive.
an autocad license is also very expensive - i still remember the first one i bought, when it appeared in a windows platform: it was the biggest check i had writen.
autocad, by the way, is not made by microsoft - a company called autodesk produces it.
i just wish that linux free software people could come up with a good cad program one day.
it would save me a lot of money - to buy playmobils...