.FTN File Extension
File Type 1Fortran Source Code File
What is an FTN file?
Source code file written in Fortran, a programming language often used for numerical computation; uses the ".ftn" extension, which is shorthand for Fortran; saved in a plain text format and may be edited with any text editor, but must first be compiled by a Fortran compiler before being run as a program.
File Type 2Flowton Diagram File
.FTN File Association 2
Flowchart created by Flowton, a free diagramming application; may include shapes, connections, text labels, and other components; can be used for software design, infrastructure diagramming, business process modeling, or other purposes.
FTN files are saved in an XML format.