For extension stands for Fortran 77 source file. You can try to open for files with Fortran 77 programming language.
Fortran 77 is a programming language. The source codes which written with this language use for file extension. You cant use these files without a compiler. You have chance to convert this file to exe format by using Fortan compiler.
If you need to learn more about Fortan 77, please take a look to following link via internet.
What to use For
which page related to For file
For Related Searches
You can check related links about For fileextension.