What is .GDT file?
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.
Recommended Software Programs to open .GDT file