The following table describes the file extensions that QuickBooks uses for files that it creates, imports, or exports.

Extension
File type
Description

.DES
QuickBooks form template
QuickBooks provides a variety of templates that you can use for your forms.

.IIF
Intuit Interchange Format file
You can import and export lists and/or transactions using text files with an .IIF extension.

.ND
QuickBooks Network Data File
A configuration file […]