Currently Being ModeratedFeb 5, 2013 7:56 AM (in response to Gosal91)
The source files must be plain text, with an extension of f90. It definitely must not be rich text, and the txt extension is unacceptable. Or the extension might be .f, .F, .F90, or others, depending on the contents of the file. Generally f90 will work. See the gfortran manual, available through a link at the HPC site.