Add a language called 'Arabian' in the Stackz Options dialog (menu Options -> Stackz Options), and choose an appropriate font where you can choose the 'Arabic' Script. This language must then be used for the attributes using Arabic characters, you can use the first page of the File Options dialog for the Language-to-Attribute assignment (menu Options -> File Options).
I don't know any Arabic, but directly entering Arabic characters somehow seems to work on my system with the appropriate keyboard selected, although from left to right... it's probably not really meaningful but technically OK. In any case you can prepare lists with any other editor and then import them into Stackz using the ListImportWizard.
Hope this helps to get you started, please post your results here so I can assist you further if needed.