Thanks a lot.
I followed the guide and tried again, but it failed because of a small problem:
It poped up an error message:
0 File(s) copied
Error in building msi
This file doe exist in the folder : D:\src\Trident\target\debug\TridentManagedCustomActions.dll
The possible reason I can see is : there is a double slash in .... debug\\TridentManagedCustomActions.dll .. .
Is that the reason? How can I solve it?