[Opensource] Expresso UML diagrams

[Grzegorz Swietlik]

I tried to open Expresso UML diagrams, from the 5.0.2 source distribution.
While opening expresso.argo file I just received the message:

Could not load the project file
...\expresso5-0-2-src\expresso-web\uml\expresso.argo
Project file probably corrupted.
Exception message:
java.lang.NullPointerException

(the similar message appears for the expresso.xmi)
I am using ArgoUML 0.12.

Is there any possibility to read the Expresso UML ?
I think it helps with learning the software.

Thanks in Advance
 Grzegorz