What is .QDT file extension?
Financial data file used by Quicken versions 3 & 4 for DOS; used as the primary file for storing the user's financial data, but has been replaced by newer formats in later versions of the software.
The QDT format was replaced by the .QDB format in Quicken 98, 99, and 2000, and the QDB format was later replaced by the .QDF format.
You can see a list of software programs here on easyfileopener.org that can open this file type so that you don’t need to search for it on the web. You can then open your file with this extension using a software listed below.