My code uses extensively #INCLUDE statements for bits and pieces of code. Right now these bits and pieces are files with the extension *.f90. This allows Visual Studio (2013) to correctly perform the syntactic highlighting of these included files. I would like however to assign to these included files a different extension (to distinguish them from the 'parents' files, which are properly formed source files), while retaining the syntactic highlighting capability.
Is there a way to do this in Visual Studio 2013?