What is .GDT file extension?
Datafile created and used by gretl, an open source econometrics program; contains economic information, such as descriptions, observations, and variables of the included data, in gretl's XML format that is used by the application for analysis.
NOTE: The data contained in a GDT file is in plain text. If you have a large dataset around 10 MB or higher, the .GDTB binary format will provide faster read and write times.
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.