Hi Shelley73
AccountRight allows users to export out records from their company file such as items through the File>>Import/Export Assistant. Using this process the system will generate a text file (txt). The separation of that text file, be it commas or tabs, will be based on what option you do select in Step 3 of the process - Format.
So if you are after a list of your items separated by commas then you want to use that export option and select to export using the commas option. This will generate a text file which most systems will be able to handle. If you fully require only a csv file it would need to be opened in Excel and then saved as such.
Should you need more assistance with exporting records check out Help Article: Exporting data