Fortran files with extensions other than F90, FOR, F in Visual Studio

[Adrian_F_1]

How do I tell Visual Studio that a certain extension other than F90, FOR, F must be treated exactly the same way visually and debug-wise as a Fortran file?  Say it's a INC file, and when I look at it in Visual Studio I want it to behave like a F90 file, in appearance, debug hovering, etc.

I thought that Tools -> Options -> File Extension might help, but Intel Fortran is not listed as an Editor

[IanH]

See Tools > Options, Intel Compilers and Tools > Visual Fortran > General > Free Format Extensions > Sources.

[Adrian_F_1]

I found it in Tools -> Options -> Intel Compilers and Tools -> Visual Fortran -> General -> Extensions

[Steve_Lionel]

See also https://software.intel.com/en-us/blogs/2013/01/11/doctor-fortran-in-source-form-just-wants-to-be-free