Inventory Custom Fields, Special Characters Encoding

If we create a new scn File with ISO-8859-1 Encoding for custom Fields that can contain special characters, the newly created LANDesk Object displays the Characters ä,ö,ü correctly. During Staging the Provisioning Template uses this information as a Public Variable and writes to a Registry Value and Enviroment Variable but will display ä as Ã

If we use UTF-8 for the scn File the created LANDesk Object will already display ä as à before staging.

Any Idea what encoding we should use for the scn File?