Hello World, hello Enrico,
Geany 0.11svn_r1456 (Windows) does not recognize files that have the file extension in capital (or mixed) letters, for example, the file foo.pas is recognized, but bar.PAS is not (and bar.Pas neither). Windows is not case sensitive (but case preserving), so it does not matter whether capital or small letters are used. Thinking about it: Does it matter for GCC how the file extension is written (.cc, .CC, .cpp, .CPP)?
Best regards Andreas