Due to no standard file name suffix for Fortran source files, and default behavior varying between compilers, many programmers, including myself, use .f90 for free-form source files. I wonder if and how much has this contributed to the mainstream perception of Fortran. If you randomly browse free-form Fortran source code on the internet, you’re likely to see predominantly .f90 files, even for new projects, Fortran-lang projects included.