How to make Geany use free-form style for .f files?

Is there a way to make Geany use free form style for f files? I currently need to use f90 or f95 files for Geany to use free form style for syntax highlighting.

I might ask why you want to do that, when most (if not all) compilers treat .f as fixed-form. For my additional thoughts on this, see Doctor Fortran in “Source Form Just Wants to be Free” - Doctor Fortran (stevelionel.com)

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I have no experience with Geany, but according to these pages

I guess it may be possible to customize the file type to be used. Also, the online manual

https://www.geany.org/manual/dev/index.html#filetype-configuration

might have more detailed information (though it may be faster to look into more user Q/A pages…)