What is .NAS file extension?
Input file used by MSC Nastran, a structural analysis program; contains input bulk data definitions referenced by MSC Nastran to analyze the stress and strain of component and system level models of structures; data appears in the FORTRAN programming language, which was originally developed by IBM, and stands for Formula Translating System; includes information such as the name of the bulk data, the number of grids, and the node locations of the elements that make up the models.
NOTE: The NAS file is similar to the .BDF and .DAT files, which are used to input data by MSC Nastran.
You can see a list of software programs here on www.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.