.SGX File

The sgx file extension is associated with the Lahey Fortran, a programming language based on original IBM FORTRAN. The sgx file stores help index.

Fortran is a general-purpose, procedural, imperative programming language that is especially suited to numeric computation and scientific computing. Originally developed by IBM in the 1950s for scientific and engineering applications.

How to open:

You cannot open this file type manually, it is accessed by the Lahey Fortran automatically.

How to convert:

There is probably no real way how you can convert this particular file type to anything else.