For

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

Fortran 77

which page related to For file

http://www.absoft.com
http://web.stanford.edu/class/me200c/tutorial_77/

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