Hello,
To import a Cadence file into SIwave you must first import into Electronics Desktop. File > Import > Cadence APD/Allegro/SiP...
After importing the Cadence file into Electronics Desktop then Save the project file. When the file is saved, then a *.aedb folder is created. Inside that *.aedb folder there is an edb.def file.
In SIwave look in the Import tab and import EDB. Navigate and choose the edb.def file in the *.aedb folder that was created in the step above.
You are navigating away from the AIS Discovery experience