I have the same issue when trying to run an AML script in ArcGIS Desktop Advanced version 10.1. ESRI's help document suggests creating a toolbox and setting up the AML as a script to run in that toolbox. http://resources.arcgis.com/en/help/main/10.1/index.html#//001500000010000000 I see the same issue - upon running the script, a Windows popup asks me to choose the program to run the AML (default it notebook). What you mean you installed Workstation? I thought ArcInfo Workstation is now baked into ArcGIS Desktop Advanced.
... View more