300 Quicken Data File A .QDF file is a Quicken Data file. The .qdf file extension is used for a data file format developed by Intuit, Inc. for their personal finance and money management software Quicken. This software provides users with tools for calculating and managing their financial records and tax details. These .qdf files are also called Quicken Data Files, and they contain a user's financial and accounting data. Earlier Quicken versions used file extensions QDB and QDT for this data. Text 1 Digital Preservation Department / The National Archives 02 Aug 2005 v.120- New description added as part of PRONOM Research Week 2024. Submitted by Brigham Young University. 03 Jan 2025 x-fmt/213 PUID abd File extension qdf File extension qel File extension